Malicious PDF — malware analysis report

Static analysis result for SHA-256 d661534bacb00eed…

MALICIOUS

PDF

77.1 KB Created: 2021-03-22 02:34:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bad74847294bb9d274b568a837f05bca SHA-1: c92b81fb87203c1348b8245b3189f093706ab8eb SHA-256: d661534bacb00eed5a191dcd4b922b1ace36132404224b0e69bc83425d4e4e19
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, including 'https://ponafet.ru/award?keyword=filosofia+budista+principios+pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates a significant number of external links, suggesting a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://ponafet.ru/award?keyword=filosofia+budista+principios+pdf PDF link annotation
    • https://pidexijot.weebly.com/uploads/1/3/5/3/135316959/83557babd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454280/normal_603d6d2a31f4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_60270e194ffb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_6032df66755c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474998/normal_600248f3668e2.pdfIn PDF document text
    • http://swiss-gear.store/53211623546dnuyi.pdfIn PDF document text
    • http://zhk-rekord.info/how_to_use_convection_in_whirlpool_microwave4skyi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474980/normal_601032696b0a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451353/normal_5fde6a91e5e4c.pdfIn PDF document text
    • http://xtina.online/99736844439p6ktk.pdfIn PDF document text
    • http://neip-forum.fun/what_are_the_expectations_in_a_relationship29zvy.pdfIn PDF document text
    • https://kixefumikek.weebly.com/uploads/1/3/1/4/131437490/biguxulofepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408853/normal_6015e17a556e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501029/normal_6013241730325.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_40e8bb2045af409db452995cf5e06707.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_4834dba3d21647128c04b90aec012d2a.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_6bdc1f4d17404b4ab1d9ee477b2d5a8e.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_4e38b15d315a4e66a682779aa59639a8.pdf?index=trueIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_d37338c6edf94fcdb9af6b6dfa59b528.pdf?index=trueIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_66eb126cd4e548e98e48ce2586d52bff.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_96337281803a4e0aaf38f008221b61dd.pdf?index=trueIn 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_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 5244 bytes
SHA-256: ec2b9eaf09a40171b8d41a240dcb20e8737a5d0a23f72156e308738a3790c0c7
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 12856 bytes
SHA-256: d74b2bfaf4b116e2a4d55127537260b7362e12e39fbc1d22d15211bacdd7e324