Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cafb9bd73ff5daf…

MALICIOUS

PDF

71.6 KB Created: 2021-06-09 08:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a743860cef58fbda5df48e108c363e15 SHA-1: ae3ecf6eabe3eefe65da460545588225d92dc671 SHA-256: 9cafb9bd73ff5dafaac8a3f40822d0380e0bad95f7ffd63626f5b57d49542ed4
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification confirm malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/pbw?utm_term=apk+crash+team+racing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459917/normal_603984ef1d429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494866/normal_603b7a6f31b45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489588/normal_5feda933e8d59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465690/normal_600d11dbc4eaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459935/normal_6033b5169a879.pdfIn PDF document text
    • https://wivewuti.weebly.com/uploads/1/3/4/6/134698804/b67e1bb7cc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365539/normal_5ff2f8b858b7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_602dcee8c47ea.pdfIn PDF document text
    • https://lagomide.weebly.com/uploads/1/3/5/3/135304015/60385fc8b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500450/normal_5fe40ba6ab983.pdfIn PDF document text
    • https://fuliribak.weebly.com/uploads/1/3/4/6/134681530/zapevab_bolomigazukikud_lezevis_mujutib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495973/normal_5ff8008fe5cd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5fd5f92edfaf0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477916/normal_5ff3adb76e578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454541/normal_5fd7108dacfd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489596/normal_5fe416599376e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494875/normal_5fee65d68daaa.pdfIn PDF document text
    • https://gakupimofol.weebly.com/uploads/1/3/4/5/134583622/db339b3700f4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nubuzefi.pbworks.com/w/file/fetch/144706206/sacred_woman_a_guide_to_healing_the_feminine_body_mind_and_spirit_review.pdfIn PDF document text
    • http://kevukimugo.pbworks.com/w/file/fetch/144880656/morning_worship_songs_for_prayers.pdfIn PDF document text
    • http://barumena.pbworks.com/f/biwijunipopeporis.pdfIn PDF document text
    • http://kepigiwup.pbworks.com/f/sketchup_2015_crack.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_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 5368 bytes
SHA-256: 78cb1a116a2a3563b0ab3d3b01789704b211d188072ff5a9f9410df3f54432cf
font_01_sfnt_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 10960 bytes
SHA-256: 74404dfbb1809f5f0ca3854161943ab3114cc9032fac1c52c40b095e3d3a3825