Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffaca2901f9d0b8a…

MALICIOUS

PDF

68.3 KB Created: 2021-09-08 22:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af29f6a89ba3635eee6bce0d111d19ae SHA-1: 6731a288694809c82bd31d5c3cef05e9538fc3e1 SHA-256: ffaca2901f9d0b8a17f7571996ee649faef131edf88f25d5d2179b84b0fd99be
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://gzafjc.com/uploadfile/files/jefofoxedevepabogeso.pdf
    • http://henghuitong.com/jingkelun/userfiles/files/20210907001203.pdf
    • https://webshopplus.nl/app/webroot/files/userfiles/files/bumuxopazaxewaro.pdf
    • http://tochuchoinghi.org/files/57873362512.pdf
    • http://mfahk.com/upload/files/virasurileleluresenixek.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210904_54F3074FE1A8534A.pdf
    • http://ferrogep99.hu/static/media/file/69886815346.pdf
    • http://www.sandipmallick.com/fckimages/file/91262158242.pdf
    • http://antoniolescio.net/userfiles/files/juzisizemamomego.pdf
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/faxuv.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161376b150b7f7---genatokumuj.pdf
    • https://dongciao.com/uploads/files/202109051021389508.pdf
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/81448324357.pdf
    • http://ecofincas.net/ckfinder/userfiles/files/53880520052.pdf
    • http://autosvilar.com/uploads/ckfinder/files/23962379773.pdf
    • https://kiaavcilar.com/upload/ckfinder/files/jinaraduxupimamoxudaroru.pdf
    • http://anindecor.pl/files/file/3202027766.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/2983220817.pdf
    • https://penzionradvanice.cz/res/file/94441192404.pdf
    • https://hoalavender.net/upload/files/kojikuwelopoxamom.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135603537df5---pimegumizesaxajalujob.pdf
    • http://twozonechickenlasvegas.com/uploads/files/vuvuzinelimafokifax.pdf
    • https://anukulagrotech.com/userfiles/file/78598966858.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=full+tilt+poker+download+android
    • 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_off0000aff4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF4 16792 bytes
font_01_sfnt_off0000c806.bin
657db34c6aa077914fcbe0289d810a0206ab187fd44896ecb89bbcf0fabf37b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC806 13892 bytes
font_02_sfnt_off0000ea1d.bin
94935bef373c5ade6031796ee9bac533c99107341f9461839af9b38f23f94c54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 10472 bytes

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