Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f044922ae634a3…

MALICIOUS

PDF

72.5 KB Created: 2020-11-14 05:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b8b421b299348d8a58828010d4288e34 SHA-1: 2c5cd5b0c6037315c9c6bad47e9780c69c38e982 SHA-256: 76f044922ae634a30a7002c24c9765687bcbbbc1b266decfb57e17db58ea8f7e
194 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, disguised as registration information, and contains a significant number of external links. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, many pointing to disposable hosting, suggesting a link farm or spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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
  • 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/123?utm_term=ncsu+registration+and+records+contact PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f9288abd0e4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_5fa899712b1fa.pdfIn PDF document text
    • https://gatilavim.weebly.com/uploads/1/3/4/3/134391542/rixidifo-tevemef-pasejiwis.pdfIn PDF document text
    • https://xuguzopagar.weebly.com/uploads/1/3/4/4/134490213/28cde630ded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_5f8923f830dd5.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/13dad7.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/c64aa9a669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_5f9cd1d1e4eb7.pdfIn PDF document text
    • https://netaterosani.weebly.com/uploads/1/3/4/4/134438803/puzitolog_lokexofud_semilobis.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/sofivutijomivar.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/ceab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f8d1f72af498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5f89a485e3e4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3163887-4c93-45ed-a796-ad5598a1193d/kukudororodetunoxigaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8c7241-e0b4-47ee-816f-b770e4dbb026/utorrent_download_mac_os.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a8a5642-2508-4029-a827-4033717a2cff/tifexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22a0c6e8-a4f7-4a15-90bb-7d71e41aed14/31726914936.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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 5044 bytes
SHA-256: 2468a21a4484ec50a46e58c5e17f50c778e1d749e50af10a8322ad12a8ad86cb
font_01_sfnt_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 11320 bytes
SHA-256: 0fc704642fecd1c53523509aa80db2c989554326e961f7a7d40e2251fc5b53de

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