Malicious PDF — malware analysis report

Static analysis result for SHA-256 add4abf65acff238…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 00:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e77c52601e9307e70e0f9bda54cd55e8 SHA-1: ac4768d4ad7446e7a7a6bc8161e9c07ce68fbb1f SHA-256: add4abf65acff238bfa3c3184639358f56282a65edbc1ac1a6f913dc70998ad2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide clickable links. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://ntct-dz.com/ckfinder/userfiles/files/88302219566.pdf
    • http://nhatnguyen.vn/media/ftp/file/milixirixigixeronomap.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/eabb5913701b6f2cdb3c59ac7531d1e5/13204507625.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a9167ea18f22634a34fa511ae0134bef/53901540866.pdf
    • http://er-trans.com/img/produkty/files/60569523252.pdf
    • https://peltonfell.org.uk/ckfinder/userfiles/files/zafunusubote.pdf
    • http://kavernoklub.com/campannas/file/71105507986.pdf
    • http://hmconcretemixingplant.ru/d/files/18275634177.pdf
    • http://npi-management.com/ressource/site-image/files/zezejegokitabosi.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/75682844332.pdf
    • https://slezanie.eu/userfiles/file/47248560283.pdf
    • https://fitness-sport.it/userfiles/file/98781341505.pdf
    • http://modern-pro.ru/files/file/rufizifolijap.pdf
    • http://pluimveebeurs.com/userfiles/file/mimolozub.pdf
    • http://swiss-ex.com/images/blog/file/fosunoxuvidetofed.pdf
    • http://twtime.com/uploads/files/202109010624302337.pdf
    • http://gonvvama.net/filespath/files/20210911095752.pdf
    • https://blokhol.com/upload/files/87321951959.pdf
    • https://fzclicks.com/demo/files/editor/file/wawezoxivov.pdf
    • http://candientushinko.com/images/file/pesoba.pdf
    • http://xhiehchin.com/Xhieh_News/_file/36085631963.pdf
    • https://www.sacict.or.th/ckfinder/userfiles/files/bejetinivam.pdf
    • https://dbjadow.pl/attachments/file/nenosutiropu.pdf
    • http://mtkshop.com/images/uploads/file/95180074411.pdf
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/jisafosanisidepinuzef.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=safe+mode+note+20+ultra
    • 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_off0000af99.bin
93820473ec6b001d69d8106b4e1359febe3818d137638189e17b2c561ec2efe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF99 14324 bytes
font_01_sfnt_off0000d322.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 16792 bytes
font_02_sfnt_off0000eb39.bin
7f528241b97524dd09ae087975df7647ba2b56de88933c4768f59e93e3d00e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 10672 bytes

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