Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dc8ac5e22e45dd…

MALICIOUS

PDF

66.2 KB Created: 2020-11-24 23:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 628f5c71a38949fd106692ab0aeb7cb8 SHA-1: 047031a615c80e9c55908e74ca82c743123fc09b SHA-256: a2dc8ac5e22e45dd6b9424ab0009472556ba5344abe5b292259dc25bb2b1ec9d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://traffnew.ru/strik?utm_term=mcoc+mastery+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412584/normal_5f9cc90ee1cba.pdfIn PDF document text
    • https://debawusajatowi.weebly.com/uploads/1/3/4/7/134707072/7126910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466175/normal_5fb6be9dd64aa.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/6781803.pdfIn PDF document text
    • https://farunigi.weebly.com/uploads/1/3/4/7/134716297/fb2da5b5b.pdfIn PDF document text
    • https://lazekikobetilof.weebly.com/uploads/1/3/4/4/134443651/juzawudosabos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetazino/81785948777.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/st_peters_portal_new_brunswick_nj.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/ladilunan.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/past_simple_and_present_perfect_exercises_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/99742278622.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/asus_rt-acrh17_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/virtual_river_discharge_answer_key.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62C 5336 bytes
SHA-256: 4cc60a10260677b5858dae4846b5d0814ca6785fe9e4d812842453bd4db58c56
font_01_sfnt_off0000d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 10640 bytes
SHA-256: 878fbbda3a55256e30891bfbb554dd4c057b378ae8283a48f19dd8a2dce5ad0b

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