Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6dd6667c0c4736b…

MALICIOUS

PDF

169.5 KB Created: 2021-06-11 14:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e3d2eb6d68069e7cfe4e7c4c4a294c19 SHA-1: 594f5a255178f4bdb6d1c995ac32add9bc093139 SHA-256: b6dd6667c0c4736b6d34d90520972f18cd6a27e8fd43737c220296dc2048d07d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of numerous external links indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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 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://cructi.ru/pbw?utm_term=the+little+prince+by+antoine+de+saint+exupery+story PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6015a1684084a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_60475b325be86.pdfIn PDF document text
    • https://volifinidolil.weebly.com/uploads/1/3/0/8/130873876/b70d60bb09f3.pdfIn PDF document text
    • https://muvepabeburok.weebly.com/uploads/1/3/1/4/131453329/a4badf8c84a2f.pdfIn PDF document text
    • https://vojufutevale.weebly.com/uploads/1/3/4/5/134521456/316171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_6067737c717b7.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/0cc95596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_60475eb99396e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413467/normal_605be088138a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mogulazedub.pbworks.com/f/spring_2019_staar_eoc_english_2.pdfIn PDF document text
    • http://jaxonewu.pbworks.com/f/how_to_calculate_a_turning_radius.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7544a9c3-b5d1-4a57-8183-f41870b0defb/15953902243.pdfIn PDF document text
    • http://bezidoxumoru.pbworks.com/w/file/fetch/144742911/firomezawiw.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/58823105301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a7c77d-ddaa-4de2-96dd-4ba6ec102e35/autocad_file_viewer_for_mac.pdfIn PDF document text
    • http://donigipoz.pbworks.com/f/98386623788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003a4a7f-aaae-45cb-b7a5-0a320faf511f/what_age_group_is_curious_george_for.pdfIn PDF document text
    • http://nudenuxote.pbworks.com/w/file/fetch/144982485/31541557407.pdfIn PDF document text
    • http://taxoxuf.pbworks.com/f/79042865395.pdfIn PDF document text
    • http://povelin.pbworks.com/f/ketilelanuvagez.pdfIn PDF document text
    • http://fisagibop.pbworks.com/f/text_to_binary_numbers.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_off00024022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24022 5704 bytes
SHA-256: 588b2202e58f0693a869d8ffe49b6a570099b26b9e69f4f24a7159426e2e970e
font_01_sfnt_off000253fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x253FB 5420 bytes
SHA-256: 0d0b7bd3b262dd5ac13cc7777d752000023705faaf58b8b2c24b106fe893c3b6
font_02_sfnt_off00026660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26660 16260 bytes
SHA-256: 46a2d7c497cb4e0841d7e185a4527bc09bb4db2cce34723d1d5997d997b8224c