Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1881bf591b000d3…

MALICIOUS

PDF

78.4 KB Created: 2021-05-13 20:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cd4875a842de09e80077ca6a7743e524 SHA-1: 66547a2333579540a6b97310e95b8b1ec252c106 SHA-256: f1881bf591b000d3ba4411fd750bb99e30d57c164f5f831211e86f11cb00b89c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://xezojetit.ru/strik?utm_term=what+is+magna+carta+in+english', is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=what+is+magna+carta+in+english PDF link annotation
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/3306322.pdfIn PDF document text
    • http://fishland.store/how_to_put_air_in_bob_stroller_tiresmg5ih.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469101/normal_605b17759ba90.pdfIn PDF document text
    • https://tulopesonu.weebly.com/uploads/1/3/5/3/135318186/6902661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_60317a3e8736e.pdfIn PDF document text
    • https://taduvovu.weebly.com/uploads/1/3/1/8/131871704/281805ccb80b96.pdfIn PDF document text
    • http://idealica-italiaoficial.site/vietnam_us_army_uniforms_for_salerjn5y.pdfIn PDF document text
    • http://hidver.com/wetarazdco9.pdfIn PDF document text
    • https://juniverobov.weebly.com/uploads/1/3/5/3/135317499/9a282cc5200c689.pdfIn PDF document text
    • http://richteam.site/cgeit_exam_sample_questions0ud3l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_60336f7041fb3.pdfIn PDF document text
    • http://icub.tech/how_much_is_a_hill-rom_hospital_bed6bqge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381752/normal_5fcf8597b3210.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_078df3d7949545ff98b2ee4941b4d4bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df9a051-318a-4218-b1b2-854f1d50d00f/84225567454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7188e806-ac0a-482b-81dc-f3d343e0602e/has_sao_manga_ended.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec65b0f-4471-4763-92d7-d69a9b6f82b6/muboxewukaneripunefafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f267bb26-e07f-4ff3-a499-363e26228a6d/vobenigogajazidelupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e53dbe43-828c-4f47-888a-66230112e70c/pogulewatenudutiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03dcfd0f-6c1d-4550-b345-296b5f2db43a/echo_cs_400_bar_and_chain_upgrade.pdfIn PDF document text
    • https://dfabac9c-3a78-4d86-b112-ccf1750024e9.filesusr.com/ugd/b46e2f_2e9e87a8b7364675a23394294f44b38a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7695c209-2515-4658-ab92-0be42a90883f/nutes.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_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 5228 bytes
SHA-256: aabc6f654b1cd7a893e2216381404cbc465d81d27738c9f1636589f89b323503
font_01_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 11016 bytes
SHA-256: 707ce06a679f2a1328c45898253553145d72e1067bc6651e626c6ad38b0b4429