Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9608ae6fa786b01…

MALICIOUS

PDF

78.8 KB Created: 2021-04-01 20:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bfa8630166538162e757e85aef506480 SHA-1: 23036cba3517ed5daf00a837ff0bc85ba7878fb4 SHA-256: a9608ae6fa786b01b2f3cb2de776c1baa082903a1fb6fd64160334260ff51b85
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable hosting and redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and likely contains further malicious content or instructions, but the primary threat is the redirection to external malicious 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://crophysi.ru/strik?utm_term=walking+through+the+city+quotes In PDF document text
    • https://cdn.sqhk.co/tosilura/jjaiijf/satonapisapalivirejeni.pdfIn PDF document text
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/befemaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382953/normal_5feaf939c8ad2.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/Qz6ukhe/58516203357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_6036d33b1c7b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5fe880e4843a7.pdfIn PDF document text
    • http://innov-cis.net/strelok_ballistic_calculator_for_iphone_freebw909.pdfIn PDF document text
    • https://vuginavoji.weebly.com/uploads/1/3/0/7/130775358/puvaget-wugid.pdfIn PDF document text
    • http://prostosite.site/warhammer_40k_8th_edition_chaos_daemons_codexxbh8e.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/icibLge/chameleon_dragon_lizard_for_sale.pdfIn PDF document text
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/471350.pdfIn PDF document text
    • https://dodesurazuxosa.weebly.com/uploads/1/3/4/3/134382101/6303243.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/8bd79c59-3bde-45c0-8ac1-fb9ec12a552f/bulizazikafegimaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c233d40c-75c1-4502-8a48-2dd87f8fa04d/21214265336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f64cfb0-9189-45e2-aedc-3bbebaa62ef5/troy-bilt_mustang_50_deck_belt_replacement.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_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 5368 bytes
SHA-256: cdf16517af98f22dfd2b7e2fd6e9f9ee978cf577fbffffb7fdc9e3a222ebdd1c
font_01_sfnt_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 10988 bytes
SHA-256: 256d323f4d5c8f49d4144ed90494f68f5cb9b707be811b555659386613aac480

Open this report in the interactive analyzer, or submit your own file for analysis.