Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1765f873c195cec…

MALICIOUS

PDF

89.8 KB Created: 2021-03-21 06:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1d72ffbaa947bdb4e693049dea143f8e SHA-1: 13f3c5435d420f989c8ea2ddc0298351311a4d6b SHA-256: c1765f873c195cec45a885cfcc8b670f655ca822f38737673ae975b38af2420a
246 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://simebofes.weebly.com/uploads/1/3/1/4/131438459/raditobikosufanabu.pdf.
  • 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://fokemale.ru/123?utm_term=representative+payee+accounting+report+online PDF link annotation
    • https://simebofes.weebly.com/uploads/1/3/1/4/131438459/raditobikosufanabu.pdfIn PDF document text
    • https://sutulozutujak.weebly.com/uploads/1/3/4/8/134884412/vuwobuzog-fitomirejuv-lefek-punuloboxo.pdfIn PDF document text
    • https://zukugobewumebol.weebly.com/uploads/1/3/4/0/134017275/7686197.pdfIn PDF document text
    • https://zofifonanofanap.weebly.com/uploads/1/3/4/8/134876640/sonajojepip-penifewonasaz.pdfIn PDF document text
    • http://pimebujeben.66ghz.com/748332226.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/62940702469.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388406/normal_5ff5c33b304fa.pdfIn PDF document text
    • http://solimurelorobiv.iblogger.org/powofa.pdfIn PDF document text
    • http://monubagujizud.mywebcommunity.org/likiwumapitunun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_601e5818c14c0.pdfIn PDF document text
    • https://valefeka.weebly.com/uploads/1/3/5/3/135345526/satojipa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_ca47a06540884e92a19addb99bfd9310.pdf?index=trueIn PDF document text
    • http://sewujajapivix.onlinewebshop.net/wopolog.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_c07bb4d187ac475d9c00b0405e9da0f9.pdf?index=trueIn PDF document text
    • http://mowiredeponup.rf.gd/answers_to_tesco_job_questions.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_21c80eecbe5a4fb0a78b731e9f86c494.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_616a9129880b4c4f93c7fcabf5a6dc38.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 5152 bytes
SHA-256: 19839c3cb3c8e937f4c98ad8f481370d3daccabfad03e8d28c1276aa38d03a09
font_01_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 11512 bytes
SHA-256: 38cb840170cb0cf7ea938a5e3b92af5d7fc918beeaa43c6ff1e67a976eae853c
font_02_sfnt_off000149ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149ED 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2