Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4fc2abcfa121e7…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 13:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c37dc3528e9b9d99ffa10831858f50b8 SHA-1: 90c0deef3f6522ea24af6cbf70cf9000fbc473d5 SHA-256: 5f4fc2abcfa121e7b13185f36d966c0bb4d1fa262dd7633403031cee2600f093
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=irregular+verbs+elementary+test+pdf PDF link annotation
    • https://trompis-tondschungel.de/userfiles/file/89685575589.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/6162862895.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/80226608739.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/75537085175.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/kodajafenedot.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/89297007484.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/pitud.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/gaxiketaloneri.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/wakamaseliditugomamewo.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/74629930405.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16306925077676.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613740b4923ce---92735130318.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/73454780595.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/xazisupobirapetefo.pdfIn PDF document text
    • http://metabolit.ru/files/file/javokemowarulizi.pdfIn PDF document text
    • https://renewone.de/files/vunomipirarexivizasotole.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/jetizefivosofitanidom.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/kapisudofevu.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/dugudonikusegagukefavul.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/tonadejarimemetijaniduzaz.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///popafapizu.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/fapoxinusoduvelomodefa.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_off0000cbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE0 11000 bytes
SHA-256: bfcff6468ed3bdd896f37b7f36bf4482b62f31787b17fa3cc748a6d65cc2f3c2
font_01_sfnt_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 18180 bytes
SHA-256: d60e3cc31c20b75297fb74894ec44b80843fc8156b0c951c38ba0d154e0cf816
font_02_sfnt_off00011499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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