Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc187b4054a809d…

MALICIOUS

PDF

77.6 KB Created: 2021-06-12 02:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9af7f21bba4b1af9c12139db4af2982 SHA-1: e15a3f98163bcd4108468de89b273ee6a08b90d7 SHA-256: fbc187b4054a809d45c493b041b563368f9f14db665bce45b9306b44a051506a
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' indicates the document's content is designed to trick users into believing they will receive a prize or parcel, requiring them to click links to facilitate this. The presence of a malicious ML classification and ClamAV detection further supports its malicious nature, likely serving as a lure for an advance-fee scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://philabc.ru/pbw?utm_term=download+vsphere+client+6.0+for+windows+10
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/5452009.pdf
    • https://xilapisozigiv.weebly.com/uploads/1/3/4/3/134341565/5848541.pdf
    • https://cdn-cms.f-static.net/uploads/4450338/normal_60bb398304c5c.pdf
    • https://cdn-cms.f-static.net/uploads/4393220/normal_605a3b5016107.pdf
    • https://bumilumijoxaxuv.weebly.com/uploads/1/3/4/4/134497753/bd6f14.pdf
    • https://static.s123-cdn-static.com/uploads/4453900/normal_5fe0ead394a2e.pdf
    • https://nabebumiz.weebly.com/uploads/1/3/1/4/131452902/bupinaresatomor.pdf
    • https://tatosexu.weebly.com/uploads/1/3/0/9/130969313/gafifadutem.pdf
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/3417635.pdf
    • https://talogaxuzule.weebly.com/uploads/1/3/4/5/134596774/jemovim.pdf
    • https://luvumape.weebly.com/uploads/1/3/4/4/134438520/5113384.pdf
    • https://xedukulabefa.weebly.com/uploads/1/3/7/5/137512956/f55be18162.pdf
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5ffd3a3f6a6ee.pdf
    • https://cdn-cms.f-static.net/uploads/4476765/normal_602c20d7cdbb6.pdf
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/beradujaziju-mabibubamati.pdf
    • https://static.s123-cdn-static.com/uploads/4445570/normal_5ff7f3f6f1fb6.pdf
    • https://cdn-cms.f-static.net/uploads/4475853/normal_6045fc0880c62.pdf
    • https://static.s123-cdn-static.com/uploads/4404299/normal_6003b35d295af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://supatibu.pbworks.com/f/short_stories_based_on_thirukkural_in_tamil.pdf
    • http://wemilamozede.pbworks.com/w/file/fetch/144869895/55419385850.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f111.bin
92bf078b3b7590a4bdc954cd6ec053186b8b8936866440d0d47d085b629f1062		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 5772 bytes
font_01_sfnt_off000104e2.bin
0c16aac26894bbb5aea7f7042145021b1ccdf2d1b2792eee98be29d87ca7d632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 10680 bytes

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