Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd32a5178fc7d643…

MALICIOUS

PDF

140.3 KB Created: 2021-06-02 09:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 87ec7ff09a8cc6d7894128bf80e999e7 SHA-1: bfce8b9d9aa49213e9f3ceb6f140390b909b9c14 SHA-256: dd32a5178fc7d643cd7cb376e4fb3d66a580971910db5ff8fe7b7cbfb3d8ef09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs pointing to a link farm hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. The document body is heavily obfuscated and contains junk data, but the presence of external links and the overall heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9736

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/pbw?utm_term=pogo+swing+unblocked+games+77 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415292/normal_605c883bdee77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_60463bd429574.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451363/normal_5fdeef1ab53e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474997/normal_5ff9da891aeae.pdfIn PDF document text
    • https://damafurota.weebly.com/uploads/1/3/5/3/135337485/xurulezolatop-gizapad-xonajovepuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393188/normal_5fcda46759d4c.pdfIn PDF document text
    • https://wemavepudobug.weebly.com/uploads/1/3/4/1/134108610/da4e71da1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369505/normal_5fe545f2bff93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_600e3e29c20c9.pdfIn PDF document text
    • https://tozuriko.weebly.com/uploads/1/3/1/4/131437247/fubudamiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401691/normal_5fdfd877c000c.pdfIn PDF document text
    • https://depoferi.weebly.com/uploads/1/3/4/4/134445349/ecb47.pdfIn PDF document text
    • https://rogebupapopax.weebly.com/uploads/1/3/0/7/130739826/reroxi.pdfIn PDF document text
    • https://rivelipa.weebly.com/uploads/1/3/5/3/135349188/latotobero.pdfIn PDF document text
    • https://nojijakifon.weebly.com/uploads/1/3/4/0/134012839/jovufibokefitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_605ce5406627e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380859/normal_6001845ec5a2f.pdfIn PDF document text
    • https://raxuvutozorar.weebly.com/uploads/1/3/7/5/137512290/komowiw_rirokupuda.pdfIn PDF document text
    • https://vinemexip.weebly.com/uploads/1/3/4/3/134306635/xadavutupiru.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufogokoges.pbworks.com/f/bechem_avantin_361_i-n.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5edd6fbf-5e1b-449e-8daa-b56b04e184a4/enthukondariveela_kanna_mp3_song_free_download.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/w/file/fetch/144470217/25350951015.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/w/file/fetch/144426576/58633489548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe193a94-8840-491d-83d6-a5ab75b37231/89438182261.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144421395/wolaraponejadurozab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c341a2b-a8cc-47e7-9c0d-c04c6533093b/were_going_on_a_bear_hunt_lesson_plans_ks1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81073d8-8876-4233-8d44-16baad3dd878/how_to_get_a_free_bus_pass_for_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63bb4947-1a9b-4350-875a-419c97515f6d/91839776301.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001c566.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C566 10016 bytes
SHA-256: 74f66222ac39427de64ab310925ebd105bce86bc51f965fa4fd56b6cdad1bd2c
stream_006_off000207a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x207A2 16916 bytes
SHA-256: b1bab3ec7019e0105b02a828c58ba6b7b99001c15c86730c2a50db5adc1f3611
font_00_sfnt_off00019d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D59 6012 bytes
SHA-256: c1ccc84f8b16c147449fbd80bcd679e208829d9a4416ac6a05f9ea509f1b8315
font_01_sfnt_off0001b281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B281 5540 bytes
SHA-256: eb5a8dff7a0a6a2ab5dea9ab3ddf4d922a6e6a3d2d93d1d31b84e72cc3b3110e
font_03_sfnt_off0001dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFAD 11676 bytes
SHA-256: 9176384be73b4e51887a77a4259bbca4de3863b32c10bbd2e3b6d81d84dc2916

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