Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a5b90b7bed3976…

MALICIOUS

PDF

71.1 KB Created: 2021-03-11 22:10:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c82faeb5b785931597e941e1b59a083a SHA-1: 1fcf92fe3e437f71daae9b756b08614da03e8a84 SHA-256: 13a5b90b7bed39769ce943a36adc79a1b542a7341e4d705211196edeb993ec2e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' points to a deliberate attempt to obscure the true destination or purpose of the links, likely to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://soxebez.ru/wix?keyword=credit+line+art+term PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470028/normal_6043e0727ed5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_603a5d3c2541c.pdfIn PDF document text
    • http://flash-sar.online/micellar_catalysisqtz9r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375194/normal_5feb0ac1b030b.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/what_is_the_difference_between_a_battery_maintainer_and_a_trickle_charger.pdfIn PDF document text
    • http://makelemeg.mygamesonline.org/kejudipado.pdfIn PDF document text
    • http://stankoff.org/bilaspur_university_ma_private_form00tfh.pdfIn PDF document text
    • http://1xbet-registrat.site/786809903438gegb.pdfIn PDF document text
    • http://gvidilon.ru/535799848653oozz.pdfIn PDF document text
    • http://choosenews.space/firebreather_cartoon_network_full_movie_downloadlz881.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458633/normal_5fce701a72c00.pdfIn PDF document text
    • http://vipmanmarket.space/dodotilyxzgc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481676/normal_600f1f36c3e21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420587/normal_5fe797a673a99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414852/normal_6002ee21728cd.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/igcse_human_biology_notes.pdfIn PDF document text
    • http://cetop.xyz/dungeons_and_dragons_5th_edition_wizard_guide4obaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472491/normal_5fcd6ccd15a35.pdfIn PDF document text
    • http://meriline.store/39637289458hlrll.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_603d10d60c742.pdfIn PDF document text
    • http://1fps.ru/88896175306817pr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lawewil.atwebpages.com/viktor_frankl_books_list.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_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 4700 bytes
SHA-256: 83db15ec389a332031db10d997a746892e9cd79046f82374d79376eb4bfd3e88
font_01_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 10196 bytes
SHA-256: c3227772de56e28f6cecc675361f8e75a8145ba1bd765b865568e74e01ee79ab

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