Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1f846970ad4baa…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 04:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f7460518022f5f0a94a5cca6d85ed921 SHA-1: ce5ac1ce7063ada805af60c193e7b639233a896f SHA-256: fc1f846970ad4baa518cb18c0bf3e4eb6e610766c6660946ef1ad1259b18ef4a
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, containing numerous distinct URLs pointing to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

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://apartmany.cucoriedka.sk/data/files/4819039310.pdf In PDF document text
    • http://oasis-inwaste.asia/files/file/dazer.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///zukotuzorufifusoku.pdfIn PDF document text
    • https://tekmaker.com/upload/files/74808074473.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/78119150844.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/22520166695.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/79478625796.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-6/20210906035513262708.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/88724399457.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/furukipofan.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/tovufefagilarevomiku.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/86841420707.pdfIn PDF document text
    • http://wdnederland.nl/file/lidazarisos.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/44681223510.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210902020046331958il5zz7.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210903_071711.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/xajevokeviboxekubagutorup.pdfIn PDF document text
    • https://micsys.in/userfiles/file/jofib.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/luvipidodumepepuzazufuku.pdfIn PDF document text
    • http://air-ned.com/uploads/files/timematuzuxek.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/gifagadejijovarefulibez.pdfIn PDF document text
    • http://ijfbn.com/editor_up/repof.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/nizomado.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/zoxofobetonoritiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=world+basketball+championship+game+frivPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BD 15732 bytes
SHA-256: 473ec042057d2567e67285c2839af99f722b7f7f5737bae4a87fbbd9c72e0d4d
font_01_sfnt_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 11360 bytes
SHA-256: 5d171186e5309831d221b07d4c15574e371ff5cab4f14244c35d2addf2b9e5b5
font_02_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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