Malicious PDF — malware analysis report

Static analysis result for SHA-256 5178956dcdf67713…

MALICIOUS

PDF

91.4 KB Created: 2021-09-10 18:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 85600b7340594b39eb2979d5b931b318 SHA-1: 6c8ce689fe8f9eecf31529b99a24480fc6c534c4 SHA-256: 5178956dcdf677134bab1344fd1816af154c83cffbfac79e6673387d42b579da
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://chcial.ru/uplcv?utm_term=f9+hd+stream PDF link annotation
    • http://yuanda-boiler.com/d/files/nejodabajunovituseziva.pdfIn PDF document text
    • https://zzhqhi.com/d/files/sivejotutadutogirowuxavaf.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/zetagosumijimexagumopik.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/9158098972.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/86838017415.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/79931884514.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/zibenawimevodetuvikejig.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/71260945942.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/58766908573.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/bifekepuruzezupige.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/kixadabaradobulivefidebo.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/lasusowusoxomolajoxowafox.pdfIn PDF document text
    • http://arsvet.ru/img/upload/nolokuxetisabebupawa.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/44781053878.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210909070827.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/tamebasulafafiwabizoteb.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210902065921.pdfIn PDF document text
    • http://sung1.com/upload/files/fiteniraluzep.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210905_374CCF2604CF40A9.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/84776802379.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/zomolepesevupux.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/wepavaxuzozupak.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/10556390502.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://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_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11595 19480 bytes
SHA-256: 66b727038456e8daf81e955abb888b56aaa9f25706c1275311009875cc9ef420
font_02_sfnt_off00014918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14918 10296 bytes
SHA-256: d7d0063080ced33ad64fb5d5ffe197433773e950a3bf89b9b91d4b170ea20001

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