Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ae7e80e9604cca…

MALICIOUS

PDF

123.6 KB Created: 2020-11-24 07:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 35fe237e021ed00e5a582796bfbd26ba SHA-1: d9c634c1e16f6b22467cbd7c448bf5d51fc103fd SHA-256: 04ae7e80e9604cca82c50765442bc174ec3e770b38cc8fb8d26fb5c69f469b02
172 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/strik?utm_term=pathoma+lecture+notes+2017+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463010/normal_5fb840b624c9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f8893b91587d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_5fb4a86d95462.pdfIn PDF document text
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/datizalirifazaxujif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_5fb87103286c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_5fa413b1c56fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446931/normal_5fbc9558350ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_5f9a1615affad.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/vavale/penusema.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/8902590273.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/project_approval_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/vanex.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/mirumejeju.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_off00019a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A93 3220 bytes
SHA-256: 2eafb78263b957cbc5a8cbdc482c6e0e160326e3c94edb7ff63dc66a50697da4
font_01_sfnt_off0001a609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A609 5804 bytes
SHA-256: 2ddbe9f175d3c0aec94e703bab680f47edd10196d50cb94eaeb18035b4f7098b
font_02_sfnt_off0001b9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9A8 11356 bytes
SHA-256: 098dae4d6063bf8ce4a3c0f20db0ca4e142ce0c8f2a6b96fa457604ddc35bad5

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