Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4769b0efbb05182…

MALICIOUS

PDF

80.4 KB Created: 2021-03-27 18:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: acda38c4fabd6646548271cba7518cd7 SHA-1: 10b1f6173a3da9c44384de33447f0ed42aedb7cb SHA-256: e4769b0efbb0518209687d4ff4dddc616db97c1c0bb732492bc839bf54022f3e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The embedded URLs and the structure of the PDF point towards an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/wix?keyword=iowa+head+and+neck+protocols+cochlear+implant PDF link annotation
    • https://kogababofaf.weebly.com/uploads/1/3/0/9/130969162/tibojomapuma_lelinaneji_kasegidig.pdfIn PDF document text
    • https://kezagoguz.weebly.com/uploads/1/3/4/1/134131769/1039317.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369168/normal_6000164f6df2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500882/normal_5fdbfb0083a9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_601fa8ce2e6d4.pdfIn PDF document text
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/1401483.pdfIn PDF document text
    • https://pefipufipukota.weebly.com/uploads/1/3/4/0/134042651/leganubaxigelil_lujidifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468836/normal_60183f89e0337.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/vunajak.pdfIn PDF document text
    • https://juviroxekeko.weebly.com/uploads/1/3/5/3/135399696/586159.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369900/normal_5ff98026e8f51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_6045f61358aa0.pdfIn PDF document text
    • https://bepixumute.weebly.com/uploads/1/3/5/3/135302933/meruf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_6018d9084c8ca.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/9007653.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/5526331.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/49abe981-5161-4c81-ac94-9a4712926c5a/hp_laserjet_pro_400_color_m451dn_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217b177e-ef6a-4c06-a6ad-bdd0a3b98bf5/60980768737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225ee722-c72c-44bc-a4c4-07c749a36593/wudarur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d64649-d486-49d4-9f87-a23b3ad398a4/galegogis.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_off0000fcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 5404 bytes
SHA-256: 6d5649bad7035160a5928324aefa70da4990b4bbdb11c42b99080af364b01488
font_01_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 10760 bytes
SHA-256: 1f6febe6d5aa1e32eef87e7328680554a86520db960f2e0cc08976718659774e