Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1026ab6b7a73b73…

MALICIOUS

PDF

71.6 KB Created: 2021-04-04 13:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 649f8ac7b50bfc4317beac6e399ffa05 SHA-1: e8eda37c31458b183001633f28383fb29eecdb51 SHA-256: a1026ab6b7a73b737bd4abeaf8ea572c9c8f1bad4de27a6dc1ee7e9a663eb5fd
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious 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://xezojetit.ru/123?utm_term=bruker+vertex+80+ftir+manual PDF link annotation
    • https://bigevavez.weebly.com/uploads/1/3/4/0/134016854/davogen.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/fhiqIhb/13647471083.pdfIn PDF document text
    • https://dofudovi.weebly.com/uploads/1/3/6/0/136092117/vatatazawulu.pdfIn PDF document text
    • https://gibuximo.weebly.com/uploads/1/3/4/6/134665594/2179982.pdfIn PDF document text
    • https://tizojutatow.weebly.com/uploads/1/3/1/4/131406606/4666121.pdfIn PDF document text
    • https://kulufitobapesad.weebly.com/uploads/1/3/4/4/134443603/mumudowalen.pdfIn PDF document text
    • http://dubifuxukev.iblogger.org/petovuxinegozuzajofajogoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393790/normal_5fc7b0c3a98f3.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/cgeheie/lijububevavesewukojokis.pdfIn PDF document text
    • https://getawupib.weebly.com/uploads/1/3/1/8/131856556/420607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486963/normal_604b2df13f4fc.pdfIn PDF document text
    • https://josodurug.weebly.com/uploads/1/3/5/3/135394296/xipomimibog.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/KhfggPc/7th_anti_aircraft_artillery_battalion.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413117/normal_60079091aaa00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_53d39d03ecbc40ad9b4ac2054884e223.pdf?index=trueIn PDF document text
    • http://waruzav.epizy.com/mcafee_antivirus_for_android_mobile.pdfIn PDF document text
    • http://pebimomedunuzux.epizy.com/street_view_maps_google_android.pdfIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_0a3d7062ef46452ca8815a80d0c8776e.pdf?index=trueIn PDF document text
    • http://xuvemotoguno.epizy.com/federal_rules_of_evidence_electronically_stored_information.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_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 5312 bytes
SHA-256: e9f60d0c8a7c6b48bc39f14c170de1df6ea6f4d75f34f702a79407d017fa34e7
font_01_sfnt_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 14508 bytes
SHA-256: b31a0f8463eae4528c8736f9efe4c59f3e15c5621d6d515b7f26b2964adae9d5

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