Malicious PDF — malware analysis report

Static analysis result for SHA-256 33911054480d28dc…

MALICIOUS

PDF

71.1 KB Created: 2021-03-09 19:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c60b8f3319cbe731eccec07d462f6365 SHA-1: b55242dcafdb5b7448d1216cab1beb2a72d50357 SHA-256: 33911054480d28dcf51f1491baed76e7f1631e2f7d4eec761f95b90443f17c34
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document contains numerous embedded URLs, with at least one pointing to a disposable hosting domain, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/123?utm_term=great+fairy+fountain+piano+sheet+music+easy PDF link annotation
    • https://cdn.sqhk.co/xusovatovu/iAPjh4R/ace_money_transfer_nepal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_6038fd238f53d.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/bVjbhi4/juxamaputu.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/gfgd9gi/xofemavikowubeboneziv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452834/normal_5fcd2072980ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_6016cb4bb184d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461791/normal_5fd8e00542033.pdfIn PDF document text
    • http://nepajos.iblogger.org/39813087943.pdfIn PDF document text
    • https://cdn.sqhk.co/jivobukafon/hiiaiel/grand_launcher_big_launcher_for_seniors.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_602c8ee13cc82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0888ca6-88ec-4bec-87ed-64a0411d1ab0/84831370479.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_4657ceacd8cf470c95e3946879e30027.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3477509-0b2d-4596-a5a2-dfad06f1737d/what_is_the_meaning_triage_nurse.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_6a067435dc1344adb20a6924abb8b7ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/630eedbd-f636-4ef3-9824-a5cb88691aa5/nemesis_board_game_rulebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a60d674c-ced0-4715-9249-64286e16a50f/85037531762.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_528690292e194cf28399d5e5815e05a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd72e11c-a9d7-4fa3-a5d4-3e14c892afd5/estimate_the_mean_and_range_from_a_grouped_frequency_table.pdfIn PDF document text
    • http://migibujefixofap.rf.gd/42362772371.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_7443a79f1af243b5915ddc4397bed2db.pdf?index=trueIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_b98bd9e167ea44258a3eb859f93b2982.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_ee7721017d4e46aea331d041ec07581d.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BE 5356 bytes
SHA-256: 7c358040b6f4256c8afedcb92be9f4a40148633b8f154b554d435c4f7d335777
font_01_sfnt_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 11488 bytes
SHA-256: a188d20d855ca3895d445e3a1147c658553a7df0859e65fe66b83fdc665d036e