Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2911d7c32477967…

MALICIOUS

PDF

85.4 KB Created: 2021-09-22 23:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ace1a2caef5382a9585e1194a201096 SHA-1: cb6194a5d53565afb0fc5a8c43a6bbdbd50ba105 SHA-256: c2911d7c32477967a54930fdb5428f73967b2d5dd2629ac42259f161b760be5c
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious content. The document contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=legit+root+tools+apk
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/82533782077.pdf
    • http://pelesiuvalymas.lt/i/File/zanigufitikaf.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cbaebb092---jinitoviwexadabomo.pdf
    • http://datavincity.com/uploads/ckfinder/files/tipokop.pdf
    • http://handgun.ee/media/file/60910468018.pdf
    • http://residencecarlofelice.com/userfiles/files/lofibobigaxarujilexiwubu.pdf
    • https://thefertilizerequipment.com/d/files/xuponedisutipokar.pdf
    • http://urbanelect.com/userfiles/file/26994393322.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/59646288503.pdf
    • https://xn--49st2et51duvk.com/upload/files/68023651403.pdf
    • http://yuhuimachinery.com/d/files/18002177435.pdf
    • http://bdsductri.com/upload/files/kajibakunawajozetid.pdf
    • http://metabolizmusonline.hu/images/upload/file/gevunoxufifaru.pdf
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/xavagezavodopigufof.pdf
    • https://padservhosting.com/userfiles/file/26704500343.pdf
    • http://villa-carlshorst.de/sites/default/files/file/10550007545.pdf
    • https://kar360.com/resimler/files/misivilijarafe.pdf
    • https://synersys.fr/contenu/file/mezonarumonakovigunat.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/dadogedul.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/87242367358.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/49294782443.pdf
    • http://thuonghieutoancau.vn/uploads/files/virapisoza.pdf
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/85559691926.pdf
    • https://serpavenger.com/ckfinder/userfiles/files/vodosufewavafogo.pdf
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/57004672562.pdf
    • 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_off0000e8df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 16792 bytes
font_01_sfnt_off000100f1.bin
86222992303195b45169f552069ffbd45309a5b356db2de75d85602d393b0de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 18532 bytes
font_02_sfnt_off000130b7.bin
f7eb44d996981df6ee342e5e8a47f7b1555106f770fd5a463e83379fab87c9d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130B7 10372 bytes

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