Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d40d260f3b9a4c…

MALICIOUS

PDF

90.1 KB Created: 2021-03-07 07:36:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 24c0c5da05038a6773ab3d19f5640208 SHA-1: 7702a824a9f945f0d9b4934999e93dfd774d8066 SHA-256: a0d40d260f3b9a4c0a85a58c360474a86130926da0580bf711985627aee8dca7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://midufefew.ru/strik?utm_term=what+causes+vertical+lines+on+tv', suggests a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://midufefew.ru/strik?utm_term=what+causes+vertical+lines+on+tv PDF link annotation
    • http://rilomenininun.getenjoyment.net/26039980591.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/hp_laserjet_3055_scanner_driver_for_windows_10_64_bit_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424632/normal_600543b0a3a06.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/fonefibamaxubaxodikolire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471236/normal_5fd87aad944fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_5fd64ad871645.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://s3.amazonaws.com/jevopemosod/vafevex.pdfIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_ae6b3787154e41a79e2b491b37cf77b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/pac_accessibility_checker_2._0.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/comic_relief_2019_worksheets.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/which_samsung_models_have_wireless_charging.pdfIn PDF document text
    • http://rixuroruwe.myartsonline.com/sebonedezuguxevedi.pdfIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_856713ace0184e53a4ca8d05bb6fc806.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidenigad/basic_subject_verb_agreement_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/37044379775.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/tesebelerinavudokologop.pdfIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_3849065c8d244f3b849825068c5325c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovitiku/15613773840.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/siwasuwewo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 4844 bytes
SHA-256: 94d4f44ca7fae6f2d79acb0e30682e94003d4475090d521a5f3a8158975646cc
font_01_sfnt_off000127ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EC 11116 bytes
SHA-256: 092ce00cfef28879c7079b228bcff6f1dda4c41adc60143998f2288246987a0a
font_02_sfnt_off00014d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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