Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab641e4ff3d11b29…

MALICIOUS

PDF

77.4 KB Created: 2021-04-08 21:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 813f683c3fe2fa50205a67164a545b7a SHA-1: 5f62c1653d7b98412a0091e145a9ccc691611895 SHA-256: ab641e4ff3d11b2910615d594bb48f5d0b7300caebf224d195db6fe30fdab1e3
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicative of SEO spam or phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were extracted, the PDF structure and embedded URLs point towards an attack pattern focused on redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=washington+gas+bill+pay+address PDF link annotation
    • https://cdn.sqhk.co/purovufizu/idYhhup/agriculture_ecosystems_environment.pdfIn PDF document text
    • http://lg-copyrightforms.com/nosekagexuninosoktayn.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/hhfpgi2/pivet.pdfIn PDF document text
    • http://form-copyrightservices.com/55887323683flpnm.pdfIn PDF document text
    • https://cdn.sqhk.co/nabixisaf/7Yjbhch/dead_age_ps4_avis.pdfIn PDF document text
    • http://tevfikyuce.xyz/gukedeelvju.pdfIn PDF document text
    • http://toguvuveleguna.22web.org/pimune.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/fjijayq/meworeluxubalujiza.pdfIn PDF document text
    • https://cdn.sqhk.co/firijanab/LiiYqjc/sitamuma.pdfIn PDF document text
    • http://rixiroremijiw.22web.org/sutiverisatarazuzilus.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/Gjd6Mhc/icon_checklist_di_excel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8458b573-1d6d-478c-912c-b10a972f31df.filesusr.com/ugd/150112_0c753f33bb274c16bfd7d1d65f9ec275.pdf?index=trueIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_69143e65220f4a46bffe06f6833b3860.pdf?index=trueIn PDF document text
    • http://lufusemeg.epizy.com/how_to_add_binary_numbers.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_80004efe304b4bb9805fb7ae2eb735df.pdf?index=trueIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_4b54498611bd4775aca03758638298f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/42063230486.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_3430a351b119457ea9660e9b0b8b2e8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/somusu.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_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 5476 bytes
SHA-256: a6fc1853bb1e1a0f4a5f15d8e9e046b7919ddf5f9eedd2f1a5942cda0bf1a6d6
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 11256 bytes
SHA-256: b98f6ee8c8435397cf8e43d0a28f5b10f7a280321ce709f76fa5164cdf28ca55

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