Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ed46775bd20856…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 07:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1978352c1c1f0b84ba14c9d01cb6224d SHA-1: e299153338b13b7f60cd1e526f1100b088c9dddf SHA-256: 28ed46775bd208569df8f282b334ff9c59606893a7d6d31f0d51603b59f72423
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true destination. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://indiantiffin4me.com/nbloom/fckuploads/file/jefusimudig.pdf In PDF document text
    • http://yongqingtech.com/d/files/tujosisirifogatawom.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/79970259318.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc53a8bdab---55448111606.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/vugeke.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/judelatop.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/lobanetiwuvidisotuva.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/teferisusakijomerawepiki.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/gisenumi.pdfIn PDF document text
    • https://irantruck.ir/data/file/71860008021.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/luxetitedavo.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/14925303208.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/71721783251.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/98588331643.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/sivonuro.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/gigubedodebufesaved.pdfIn PDF document text
    • http://cissi.it/userfiles/files/9184803987.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/10451185906.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/sitosalegibo.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/gudinenelijebajo.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/67323078411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=barcode+scanner+android+programmaticallyPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62C 11024 bytes
SHA-256: fbdb83b15709f689d80c748b452acda88dccc5bcadcb5d7bfe35b3dd0fed68da
font_02_sfnt_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 14596 bytes
SHA-256: e2b08870cf9b96fa4fa45165dc927386d6d04fddab04d4654b14213c9ff6be0c

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