Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f892a2138d523b7…

MALICIOUS

PDF

70.6 KB Created: 2020-12-04 01:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 2fcbc83d0f79a804908943ceddbded37 SHA-1: 523f63da3d54cec75afdba0f167e7afcae3f7706 SHA-256: 2f892a2138d523b7dc35ab081b86d5a4719085f074bbbf395199e069176143ed
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The embedded URL `https://traffset.ru/123?utm_term=excel+practice+exercises+2013` further supports the phishing pretext by referencing 'Excel practice exercises 2013'. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://traffset.ru/123?utm_term=excel+practice+exercises+2013 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392191/normal_5fc35355741c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384650/normal_5fbe3cca65425.pdfIn PDF document text
    • https://bawenijujobafo.weebly.com/uploads/1/3/4/6/134670929/89cffcef9d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_5f9a0e39ce5e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f892f5c1bf3d.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/183c9fcbfa3f.pdfIn PDF document text
    • https://mikudone.weebly.com/uploads/1/3/4/3/134370159/1165443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486206/normal_5fad88e9b2c43.pdfIn PDF document text
    • https://zidajikivumab.weebly.com/uploads/1/3/4/6/134625594/fokofob.pdfIn PDF document text
    • https://ruxesewafemowur.weebly.com/uploads/1/3/4/7/134761388/a6c5992234d7.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/6781edf23db36e.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://s3.amazonaws.com/zupenafud/kuta_converting_degrees_to_radians_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7962f281-1c19-415d-8e7a-e570cc6cd259/rochester_white_pages_phone_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d4213f-7684-4d13-89eb-9a7e73bc94d9/kunoso.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/flange_ansi_b16_5.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_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 5012 bytes
SHA-256: 7dcd9ab81848ac52261a9708a3a19a0da7035ad6235ce374e879b2f9c815caf5
font_01_sfnt_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 10776 bytes
SHA-256: dae13c634b2e219763cc593e0bbad09fea82506b7cfad4accda8b639c2c35d08
font_02_sfnt_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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