Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b940393bd2b46ae…

MALICIOUS

PDF

98.2 KB Created: 2021-06-14 05:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f0ac4ed83b2ab509bb482ed27a00e3e8 SHA-1: 76654c10b64be86f6bbac6adc3824214d80b3f58 SHA-256: 0b940393bd2b46ae28d355fa682ef7213195077f07fbc2f6c1f1062eee348a9b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/pbw?utm_term=assignment+problem+hungarian+method+example+pdf PDF link annotation
    • https://kenitavujene.weebly.com/uploads/1/3/5/9/135977886/fupunulorokiponosu.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/tuwakizuzakuloj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410015/normal_60016768dc4d5.pdfIn PDF document text
    • https://xexiwimelogodit.weebly.com/uploads/1/3/4/5/134593193/5918933.pdfIn PDF document text
    • https://kisezuxuromo.weebly.com/uploads/1/3/0/7/130776201/muvojojomojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_603d6d3a84a36.pdfIn PDF document text
    • https://malibuvebejonab.weebly.com/uploads/1/3/4/5/134524684/09e3b902e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486365/normal_6037234c91c40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_60bb57de0b7d4.pdfIn PDF document text
    • https://genifefesabido.weebly.com/uploads/1/3/3/9/133999330/f30b76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527902/normal_6056468192480.pdfIn PDF document text
    • https://pamumigupoxip.weebly.com/uploads/1/3/4/6/134614169/ramafazenevoxu_sajadigurumumex_zaxaputofimolup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495251/normal_6015eb1949745.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jotoxipigi.pbworks.com/w/file/fetch/144584133/1880261884.pdfIn PDF document text
    • http://fafukite.pbworks.com/w/file/fetch/144704796/flowjo_download_free_crack.pdfIn PDF document text
    • http://serizedez.pbworks.com/w/file/fetch/145101192/how_do_i_find_my_snapcode.pdfIn PDF document text
    • http://ganosidil.pbworks.com/f/mapugivepidobit.pdfIn PDF document text
    • http://sejawes.pbworks.com/w/file/fetch/144716526/33575467400.pdfIn PDF document text
    • http://zilebunod.pbworks.com/f/mosixizixixaguje.pdfIn PDF document text
    • http://garigor.pbworks.com/f/48546046267.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BD 5652 bytes
SHA-256: b580dd382eea731007922d4c1994b65027a3e6669caf2543eaf85de72d3a93dd
font_01_sfnt_off000139c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C3 12704 bytes
SHA-256: be5f8eb4594af19b08d7ca5cadaede359c4839f5ca965431bf07f23107e57ee9
font_02_sfnt_off0001645a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1645A 16540 bytes
SHA-256: 749071925473f3d4b39c705823be5a5920d6da3330d6167d24482f9ad6060768