Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3bad989792fd5d…

MALICIOUS

PDF

95.9 KB Created: 2021-02-10 06:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6c4723589d004a7f37f9bb9b0c60d55f SHA-1: 46c79aa050a51c27d62d43499a054a52ffd6c3cd SHA-256: ff3bad989792fd5dd8dafef8b485619c6fe9e15f6b3b3f7ab61931cd9d25d011
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS' heuristics. The document body, though heavily obfuscated, appears to be a lure related to roofing sheets, suggesting a phishing or scam attempt. The presence of numerous links on disposable hosting further supports a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=corrugated+concrete+roof+sheets+asbestos In PDF document text
    • https://cdn.sqhk.co/zowonefaso/ievWKzP/61340898491.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420438/normal_5fcd3f60cdd6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453332/normal_600166dea2e2d.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/dieyhQO/57965099444.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/qHV2iiM/takeletaludelagone.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/sepabekosigaxagorasavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_5fdab6b11580b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449184/normal_601ca7adebf45.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/fKQigbv/83640287257.pdfIn PDF document text
    • http://jerijoba.iblogger.org/48629482936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418175/normal_5ffb17b55f383.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/obidkic/applock_fingerprint_pro_apk_revdl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://somesituziki.epizy.com/chuchu_tv_hd_video.pdfIn PDF document text
    • http://derovis.rf.gd/glencoe_mcgraw_hill_science_8th_grade_answers.pdfIn PDF document text
    • http://pidukuniwid.epizy.com/acls_pocket_cards_2015.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_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 5296 bytes
SHA-256: 1fe50ee348b19737f945d61a0c735bf5a12725bfe8e21412a3680b2516b6f05c
font_01_sfnt_off00013674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13674 11364 bytes
SHA-256: cbac8e5110a1bad4e52d54228f0eaf716621f480e8126273b830ad73d652d940
font_02_sfnt_off00015d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1B 16148 bytes
SHA-256: 43dd7310e986e37c0562d6efd2a67b6291a0d41fa892ecd43b306c3e7231f7b7

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