Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6632312cf86eab…

MALICIOUS

PDF

74.7 KB Created: 2021-01-30 19:21:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 36870056115c0b2708261aaab7b3e576 SHA-1: 6ea410e54e787ea4013ab16d2f367660cab1c5db SHA-256: 7b6632312cf86eab38649e13fa4a5b73d4b0738b2765103f4769c1c90cc3e4d8
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 pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=google+drive+captain+marvel+1995 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367308/normal_60089a88a9f25.pdfIn PDF document text
    • http://ukranews.site/singer_4411_stitch_guidep8k20.pdfIn PDF document text
    • https://kutawujotin.weebly.com/uploads/1/3/4/0/134016956/494916.pdfIn PDF document text
    • http://podjem2.club/87609396559q6qw.pdfIn PDF document text
    • http://todayit.pro/bolowesemejituwasur4u4rt.pdfIn PDF document text
    • http://help-business-media.com/viwukupagabegopotijy05ya.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372972/normal_6002708b476ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477376/normal_5fd1ff0c38f65.pdfIn PDF document text
    • https://mojivuza.weebly.com/uploads/1/3/0/7/130775228/b5a3bc424d0.pdfIn PDF document text
    • http://remont-pc.website/parallel_multiple_account_apkc9ix7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378383/normal_5fdd169a2e563.pdfIn PDF document text
    • https://gomujivas.weebly.com/uploads/1/3/5/3/135321586/8741575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484623/normal_600d85504519f.pdfIn PDF document text
    • https://webebusili.weebly.com/uploads/1/3/0/9/130969565/fakakomuwosevolumex.pdfIn PDF document text
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/dexupamazur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 5640 bytes
SHA-256: 81163a6a85b40457e960b1a01e7de52753cf4a52e8fa20653cd97b10823d776a
font_01_sfnt_off0000f99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 10672 bytes
SHA-256: 81966312801b0fa4e449fa358772c55c10e32f8787a3823236bc584b7608709a

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