Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3633a8b70a85b5…

MALICIOUS

PDF

72.7 KB Created: 2021-09-08 12:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: beb6b68fbd7932ad24aaa8a5f3ac38c4 SHA-1: 6f6de2cb8a7f854fd1df3a810e1a9372e2ee075b SHA-256: 9c3633a8b70a85b5a0b4bbb4d9c43bbddfc1e341e8e954664d177c9f663c3e74
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. The PDF contains numerous embedded URLs pointing to external PDF files, many hosted on domains with low reputation, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://materialdeestudo.top/userfiles/files/35969631791.pdf In PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/sifipulibanoxebudosokek.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/jifisosijegujifesuwomex.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/97217617374.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/febiriworakorebu.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/20687636025.pdfIn PDF document text
    • http://feg.vn/uploads/files/24242711692.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/80943180368.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a78e1d974338a9a4b244aedb0be74393/50229183538.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ribejemepafotijoxinogiba.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/011117573565.pdfIn PDF document text
    • http://fittbikese.hu/files/file/furalovexefevasit.pdfIn PDF document text
    • https://scalping.ir/data/files/file/2077701860.pdfIn PDF document text
    • http://soles2walk.cz/data/file/vekuvogelazikojoxegu.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/63535389250.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/xilipazetaveti.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/genunibawejinevadiva.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/39050837427.pdfIn PDF document text
    • https://bawauang.com/contents/files/85324001036.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/bowefuwibixasoniribakeb.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lqduaeb5qmv17971a1c8gienk5/tugukaripavugifulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cpe+use+of+english+1+virginia+evans+pdf+free+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B1 16384 bytes
SHA-256: d6696aaa31b89a607a04a6d7369bfcf458e754f7b9c92a563213100d4361aa3a
font_01_sfnt_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 11016 bytes
SHA-256: 06acd88de03e17367666e9a31c7955d6e19e7de63af37dc2e236e135effa7440
font_02_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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