Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8f7f91c8ca130d…

MALICIOUS

PDF

68.8 KB Created: 2021-09-18 06:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c847b666bcb3f8c1ee0aa7cace55ca7 SHA-1: ff8debb5fec8873bf97d5dab877c1f25b4c80af9 SHA-256: 3a8f7f91c8ca130d25d4503f70265d438e6d4267471a9e6332b0b15e5410fed5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a large number of embedded URLs, many pointing to potentially malicious domains, suggesting a link farm designed to redirect users to harmful content. The presence of 'cmd.com' in the document text, alongside multiple PDF URLs, indicates an attempt to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://linyuepharm.com/upload/files/sedirixevatirizokineza.pdf
    • https://viadagio.be/userfiles/file/69375337857.pdf
    • http://qdcmd.com/data/files/96927759286.pdf
    • http://www.hussco-steel.com/husscofiles/files/xazaluzezolopuvatexan.pdf
    • https://gedayapi.com/userfiles/file/66092548031.pdf
    • http://calisnt.com/uploads/files/sebuwozomafi.pdf
    • http://clinicaveterinariagoitese.it/userfiles/files/71245795600.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613764f9e0767---27887891040.pdf
    • http://tainanrup.longi.tw/uploadfiles/files/20210903_105901_3136.pdf
    • http://hmondo.com/userData/board/file/66016916152.pdf
    • https://misbahelmudii.org/ckfinder/userfiles/files/37739756946.pdf
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/gorapuforarak.pdf
    • http://zgkimsteszew.pl/img/upload/files/vobisitanigedulenulenut.pdf
    • http://snailgame.ru/upload/files/20210913090325.pdf
    • https://inprovitcaribe.com/ckfinder/userfiles/files/puxelibapiniresodugogoge.pdf
    • https://kaktutzhit.by/uploads/files/6592328805.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384a76134a5---xekotazape.pdf
    • http://location-appartement-venise.com/italie_documents/files/28644519213.pdf
    • http://silver1979.com/upload/file/88125892570.pdf
    • http://londonjip.com/userData/board/file/monila.pdf
    • http://cp-1.ru/userfiles/files/lixibanoxa.pdf
    • https://inunekocp.jp/mailmagazine/upload/files/21306427933.pdf
    • http://etpatatietpatata.com/userfiles/files/30097886471.pdf
    • http://www.hussco-steel.c
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=can+i+use+android+app+on+iphone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af98.bin
eb97ac22db85f7856752dcb7f165a44370234c4543caa9da2b55654d73a71cd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF98 10476 bytes
font_01_sfnt_off0000c74c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 16792 bytes
font_02_sfnt_off0000df5e.bin
593ad59537f3ec107a060a4e6d4263a7adebe3941cef34c1a519b6b485e09f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 15176 bytes

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