Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbfda370f9cf9dc…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 05:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8a5390cf2c46a1a3979abd6f1b2710f2 SHA-1: d649a5e181151d1dd1d102387c52cab222c49b67 SHA-256: 0cbfda370f9cf9dcd512f6c7bb9c827f0ff98322305fba0a986da28eb3cd7c7f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document contains a link farm with multiple disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the presence of numerous unknown URLs points to a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://preiss.at/upload_files/files/65213472545.pdf In PDF document text
    • https://vpmemorial.net/images/file/4078432758.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/51310031079.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/90667718362.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/55516907136.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/patepikoro.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/78048917730.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/83111234228.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/nuzujelifagel.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/16033173961.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/juniviw.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc47e8f482---ranozula.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/kegomufimidarulif.pdfIn PDF document text
    • https://kar360.com/resimler/files/95966675887.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/40838684060.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/897030322.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/22906433018.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/83752194847.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/97477106202.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/xabagudip.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/17922267891.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c6d26bc00c44513f767033dd81852d6e/80442731089.pdfIn PDF document text
    • https://phm.vn/upload/files/wesus.pdfIn PDF document text
    • http://ahppesticide.com/userfiles/file/gifotibebige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=igi+1+apk+download+for+androidPDF 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_off0000b1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C5 10456 bytes
SHA-256: 1b5f67cd60e2bb6119c83972676a2c507c8560c3564edc12180c9040c4b7c6be
font_01_sfnt_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 14976 bytes
SHA-256: 9abb748db19fb48b0d32fb0a0d6d68c06115da50337b40b1ac5949eb4d848e9f
font_02_sfnt_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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