Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a896b2c83755969…

MALICIOUS

PDF

74.9 KB Created: 2021-06-05 00:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6afc7961333282d2d68e5ec97eb92895 SHA-1: b13e500648102926468f2efc99049ddf7d26aa06 SHA-256: 1a896b2c8375596905b33d87182b95fe46cc9f4a16c8b1291f2c33ec64ae29c5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://jumiwimov.ru/123?utm_term=create+html+email+template+free
    • https://likeledizu.weebly.com/uploads/1/3/5/3/135312051/moxize-mixewiriv.pdf
    • https://cdn-cms.f-static.net/uploads/4413347/normal_604197f1a5691.pdf
    • https://static.s123-cdn-static.com/uploads/4391898/normal_5fe139d0804f7.pdf
    • https://cdn-cms.f-static.net/uploads/4481825/normal_606d91ce22fc0.pdf
    • https://bibuzutevokad.weebly.com/uploads/1/3/4/6/134634257/54520327b2f3.pdf
    • https://femerofuvarilef.weebly.com/uploads/1/3/4/0/134012326/ff6209c1de0c38c.pdf
    • https://nigipesifagezeb.weebly.com/uploads/1/3/1/4/131411762/dozutenivafaj.pdf
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5fda027a89f64.pdf
    • https://cdn-cms.f-static.net/uploads/4444366/normal_60379030f28f1.pdf
    • https://cdn-cms.f-static.net/uploads/4383680/normal_6022d5ec79c25.pdf
    • https://cdn-cms.f-static.net/uploads/4487208/normal_6066feaa6f2af.pdf
    • https://vatalinonabalix.weebly.com/uploads/1/3/4/2/134234662/dulumama-ragen-mafixubuxemejo.pdf
    • https://mudizuponiwox.weebly.com/uploads/1/3/2/7/132740987/8579967.pdf
    • https://static.s123-cdn-static.com/uploads/4463287/normal_6007117a1323e.pdf
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/kodefugapu_nimemadirizagip.pdf
    • https://waguwejulunesu.weebly.com/uploads/1/3/5/3/135301122/lasaxawe-benojujukogifi-jularifu.pdf
    • https://cdn-cms.f-static.net/uploads/4402948/normal_60358775f408f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/644300f0-ee47-4a6b-a3d8-8130a34818bd/7648852991.pdf
    • http://zilebunod.pbworks.com/f/27137088143.pdf
    • http://lekipirunezi.pbworks.com/w/file/fetch/144415644/31528921437.pdf
    • https://uploads.strikinglycdn.com/files/99dd9c6f-bb00-4e27-b028-82ffb994b041/vovopozoga.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_off0000e6be.bin
5a3babe5875aecd4af95b3c2df05ce1010e10ef4097dd0762de7021ff7f7cbe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 4868 bytes
font_01_sfnt_off0000f71a.bin
c22183c0e2bc56732ddd9d072686d311275f1e2ee93f49b3236c016c9558830b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 11052 bytes

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