Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8cfa4851666ec7…

MALICIOUS

PDF

72.8 KB Created: 2021-02-23 10:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 7daa2deb44305871762ba6f6f3ed85c6 SHA-1: 4010812e3264ee12b0f19e4e68548bce762cc242 SHA-256: 8f8cfa4851666ec7b79dfe3de9464a044b59b68b64b537b8a5e48a6d52a94e79
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with several pointing to known malicious redirector infrastructure and disposable hosting. The heuristic firings indicate this PDF is designed as a link farm, likely to distribute malicious content or phish users. Although no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/wix?keyword=types+of+telephone+system In PDF document text
    • https://cdn.sqhk.co/tatidukigag/hdjhhdp/guess_the_movie_answers_level_11.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/6379899.pdfIn PDF document text
    • http://herss.space/hell_divers_book_wikiwx5t3.pdfIn PDF document text
    • https://xivogere.weebly.com/uploads/1/3/0/9/130969247/kipakameke.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/jiegjjf/knife_hit_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_6022f76805355.pdfIn PDF document text
    • http://bathforlegs.xyz/4274363570680yvk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452588/normal_5fca021faca13.pdfIn PDF document text
    • https://cdn.sqhk.co/digiwejasipu/aTuGgjT/95014217562.pdfIn PDF document text
    • https://xozisimoxu.weebly.com/uploads/1/3/1/1/131164350/loruxotetol.pdfIn PDF document text
    • http://bred-enligne.com/juzodelefafesikoviros5cg6u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477387/normal_5fd2f86acb064.pdfIn PDF document text
    • https://pibefugaradaxo.weebly.com/uploads/1/3/1/3/131398186/newinewap_zogavuzenazujuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_6024255514b26.pdfIn PDF document text
    • https://votobadopa.weebly.com/uploads/1/3/1/4/131483772/mepabijidizadotiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/pojug.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/20709762231.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/free_thesis_presentation_template_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/caste_obc_full_form.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_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 4884 bytes
SHA-256: bc347c773809b7573e792285dab8358d4220d24056bfa71e4a238cb122095756
font_01_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 10060 bytes
SHA-256: dcaf8c52d8a677fcd9665e3acc316208b3b470c9dd08c2289167c81c445c9fc7

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