Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b2b7cf3fe616fc…

MALICIOUS

PDF

81.0 KB Created: 2021-06-09 00:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f83ff7113fd39972965c8ec52ecc4004 SHA-1: 490a85e4859136559e9bc5c8f87bc35874b65c8b SHA-256: 06b2b7cf3fe616fc11bf2b4f9f7cf888ee73787db2eb2f0443f22ed13718e81e
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. ClamAV and ML classifiers strongly flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://huntic.ru/pbw?utm_term=mary+wollstonecraft+shelley+books PDF link annotation
    • https://wisukemebo.weebly.com/uploads/1/3/5/9/135962546/3a5f46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448332/normal_5fe77b66ab001.pdfIn PDF document text
    • https://popivuzumozula.weebly.com/uploads/1/3/4/5/134500063/gedepex-wemos-katirativux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_5fffb36497149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_600fac25dcb2c.pdfIn PDF document text
    • https://takaweso.weebly.com/uploads/1/3/2/3/132302848/gatoxisotaxokafas.pdfIn PDF document text
    • https://noribiri.weebly.com/uploads/1/3/5/3/135347041/xores.pdfIn PDF document text
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/2786415.pdfIn PDF document text
    • https://zubosaverebaf.weebly.com/uploads/1/3/4/4/134468350/pinilaziborumu.pdfIn PDF document text
    • https://kamurodogoruvax.weebly.com/uploads/1/3/4/8/134887894/8776614.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374682/normal_60017f4cba892.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0faa4af7-cc85-459f-ac11-26198d446ea4/wileweginabeb.pdfIn PDF document text
    • http://vowijeve.pbworks.com/w/file/fetch/144899109/sidiku.pdfIn PDF document text
    • http://fuxotatizexu.pbworks.com/f/95347506906.pdfIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144470241/zipetupe.pdfIn PDF document text
    • http://joraxakegeg.pbworks.com/w/file/fetch/144549621/manual_for_rca_55_inch_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a678a30-b8e8-4140-805f-e75b5b9b9efc/avaya_one-x_agent_2.5_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb9c96b6-34dd-411b-8efb-3fda269ae7d1/2361293786.pdfIn PDF document text
    • http://fijinatuzut.pbworks.com/w/file/fetch/144606069/67981765283.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/w/file/fetch/144670281/download_game_psx_iso_yu_gi_oh_forbidden_memories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd1eb6d-2893-44c6-8e00-3ba8b5c680a9/3907690005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8956cbf-9ede-4220-b3ab-01245b87c2a4/what_does_credit_decision_mean_at_ufs.pdfIn PDF document text
    • http://papoxuva.pbworks.com/w/file/fetch/144900426/ark_tranq_arrow_calculator.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_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 5372 bytes
SHA-256: 5caacc9845ef1e41644366bed3c30af747c00b8ffdf13fdf94000edd9c70a2c1
font_01_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 10912 bytes
SHA-256: a6c9927d6cab6c8d5e237b14fe4b9005d0434b92e71cbcbf07f3b277b15ecf22