Malicious PDF — malware analysis report

Static analysis result for SHA-256 350c8d7c95f17c31…

MALICIOUS

PDF

73.9 KB Created: 2021-05-12 07:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c0a273a8044d5410a47f83c0a0c37904 SHA-1: 9dc9b926f654dc8252253ac1fbb1b606c6627250 SHA-256: 350c8d7c95f17c318c1cb2f31640716cd6b2535df537689b0c6bfe6d154d3ab0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://jottigo.ru/strik?utm_term=v+shred+ripped+in+90+days+reviews PDF link annotation
    • http://vugewanir.22web.org/pap_screening_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_600909dfc93e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478933/normal_60579dc1481ac.pdfIn PDF document text
    • http://pshcomonhere.xyz/wevarupigamuxotunakriskw.pdfIn PDF document text
    • http://kilewigi.iblogger.org/tui_ad_yeah_right_template.pdfIn PDF document text
    • https://cdn.sqhk.co/suzagofi/iZBibvq/basun.pdfIn PDF document text
    • http://hightrade.club/what_is_the_definition_unity_of_commandt4b4q.pdfIn PDF document text
    • http://tosety.xyz/dofulesazekalowobuyecy7.pdfIn PDF document text
    • http://rifivejawix.22web.org/cake_making_process.pdfIn PDF document text
    • http://momentikshop.space/zawukolodoxizifuzetadi31rl8.pdfIn PDF document text
    • http://kyponnik.online/android_architecture_components_kotlin_githubdboja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420915/normal_5fce7966693c6.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/FijDJhb/28155696040.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/fgcBDQM/guided_meditation_for_deep_sleep_female_voice.pdfIn PDF document text
    • http://migerov.xyz/bullion_van_rema0fsmh.pdfIn PDF document text
    • http://kifepivukog.iblogger.org/2283830316.pdfIn PDF document text
    • http://womumonafip.22web.org/fomiredezazep.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofilexi/gdQgjjj/19368331590.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijuxire.epizy.com/nuwevololo.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_off0000e0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 5532 bytes
SHA-256: 9ba534d118e35753b81ca12d6a81c9093fd3c278fd843a701fa4bb8dce4bf150
font_01_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 11324 bytes
SHA-256: a6e01484f8c117eabbadd48272bf2c0d46cecc068786936a4b54634e05c63390

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