Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa951a07fc184221…

MALICIOUS

PDF

69.8 KB Created: 2020-11-30 18:00:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 87372d3e74b94ae52745efa55539ca79 SHA-1: 4a5a92cd428cd01ff6f19c2b98d94cfbcc50fc13 SHA-256: aa951a07fc184221cff450da066a65d54e52258badd223cb0b0b40ca95fa89df
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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://traffset.ru/aws?utm_term=motion+to+strike+errata+sheet+texas PDF link annotation
    • https://nakumebugutadut.weebly.com/uploads/1/3/4/6/134650701/magiwukemezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5fa66062e0e5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_5fa89de974fca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454277/normal_5fa74b422ff22.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/951229750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480756/normal_5fc030d14dbd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374685/normal_5f8db2617fff5.pdfIn PDF document text
    • https://wenadexedodoren.weebly.com/uploads/1/3/4/3/134322255/manugawibim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470020/normal_5fc290d4d96bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f96038a1ca11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_5fa30d413c475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455370/normal_5fa08f2a22b4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdef0008845d09244f2c03/1606283008348/magicians_quest_mysterious_times_reddit.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_off0000d4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 4880 bytes
SHA-256: bf678fd72fe4f38c37bf1cd3f9b7f8256f571be477bac9e0f8ac61a1c7c03fbb
font_01_sfnt_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 10656 bytes
SHA-256: 1c1d7e1e9d1b19b6786643e41fff20c13a440c41e673eb83689acebd6084315b

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