Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba12c9f7a338e9f0…

MALICIOUS

PDF

76.5 KB Created: 2021-03-08 19:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9c72ebe0b4fe213517b060dd1047e00d SHA-1: 7f549e6612e4b953460dd042e6797dcf4c453d3c SHA-256: ba12c9f7a338e9f01ed2d970412ce5e05ab752c54fb73b8b54e6182500e714a0
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate maliciousness. The document body, though heavily obfuscated, contains text related to merging PDFs, which is likely a lure to direct users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/award?keyword=r%25C3%25A9unir+deux+pdf+en+un+seul PDF link annotation
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/fawidesuboj.pdfIn PDF document text
    • https://jotavitot.weebly.com/uploads/1/3/0/7/130738821/tuxetafana.pdfIn PDF document text
    • https://jabikazisejifo.weebly.com/uploads/1/3/1/6/131606509/c39eaee2125c.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/14330785875.pdfIn PDF document text
    • http://pivowave.iblogger.org/96829497223.pdfIn PDF document text
    • http://nejamaranidirit.22web.org/58143354186.pdfIn PDF document text
    • https://dejalujufoleto.weebly.com/uploads/1/3/1/3/131378776/lakuvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_fe31b1eae6c4481182b6b1d77ad40b2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d211a577-4d95-47cf-a6a3-8e853b7b12bd/game_of_thrones_clash_of_kings_chapters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e9ea99-6441-492e-ae72-1e7c98f2e320/craftsman_109_lathe_manual.pdfIn PDF document text
    • http://lojetejimekatow.rf.gd/74ls90_decade_counter_datasheet.pdfIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_6163c7639d7040ed8324bdb355b378ba.pdf?index=trueIn PDF document text
    • http://zisafaziga.epizy.com/presidential_election_result_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41931e42-4b7a-4f95-838c-83aad324c462/doro_cell_phone_for_seniors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc142fa1-79b2-489b-ad2d-f196e0eb6c5a/13275923180.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_e8e77fca62054a9b9faabb99ea5fb9e6.pdf?index=trueIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_4a2d11b6548a46aa91d6c3046dbeb1bd.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_7f2a2d0c75cb46fe87b84acdf4f74986.pdf?index=trueIn PDF document text
    • http://vizomonuzujo.onlinewebshop.net/77066399872.pdfIn PDF document text
    • http://wuvesuwenelagaj.rf.gd/tamil_nursery_rhymes_video_songs_free.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 4732 bytes
SHA-256: 8696319a8e57f53c291d0100533fac3d2ac5617710dc5a734138efb6e6b3c5e2
font_01_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 11892 bytes
SHA-256: c9e6768c2ab38344f015c2b066db8c72f46e36c3ed428ab986019d5ad5a41f6c
font_02_sfnt_off000114bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3