Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d37054dbf3c2bf7…

MALICIOUS

PDF

78.5 KB Created: 2021-03-26 10:02:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 63acf63f2589fd9c9e0e3fdbe4148741 SHA-1: f59d64c7767e9f2d2645407d4de004938151c7a9 SHA-256: 3d37054dbf3c2bf7d73cd6abcf6977e541adcc2e8b4ec2273f5870fcd4ecc1d7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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
  • 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://pelibifir.ru/strik?utm_term=computational+physics+mark+newman+files PDF link annotation
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/fetunekikosamel-baguki-filune-nufatimilegu.pdfIn PDF document text
    • https://tunikasas.weebly.com/uploads/1/3/1/4/131438809/vobuvawe.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/66896396845.pdfIn PDF document text
    • http://verifybadgesbusiness.com/guboweokyiw.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/lOyjgX9/827158761.pdfIn PDF document text
    • http://gegejobusi.22web.org/top_10_free_books_sites.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdfIn PDF document text
    • http://airbin.top/whats_up_danger_spider_man_free_downloadh5hbr.pdfIn PDF document text
    • http://mivimivisodawo.iblogger.org/sizemezelosuj.pdfIn PDF document text
    • https://vabusidi.weebly.com/uploads/1/3/4/7/134765039/wuwudosopinoxisejop.pdfIn PDF document text
    • http://mateguwokalidub.getenjoyment.net/xunefadoledex.pdfIn PDF document text
    • https://bobenetawif.weebly.com/uploads/1/3/4/6/134666578/toresadim_pebofaxapamenot_nakelibaso.pdfIn PDF document text
    • http://love-your-lips.online/ripijoxipenizedikukutumg4.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/simplified_badminton_rules.pdfIn PDF document text
    • https://lavafijaxeb.weebly.com/uploads/1/3/0/7/130740432/54addc0852ecb.pdfIn PDF document text
    • https://cdn.sqhk.co/ritasuxa/6s7haid/bitenivanizubeborifev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/pogewuxipudivemedilure.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_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 5416 bytes
SHA-256: 737e424af3c849c2200282c4b0ca04351d9f42a7e8cbc9a32003975cf9f05e6f
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 10696 bytes
SHA-256: a16bccb5c49177567bc7f2f74050952b36928d7d124ffb3605183ad97191093e

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