Malicious PDF — malware analysis report

Static analysis result for SHA-256 031149040cdf696d…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 11:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9161e12e230134d2b991a24ce07aabd5 SHA-1: a157a3fd60bd16e24754c519d73ab249f3415467 SHA-256: 031149040cdf696d14ce7c82de6448699db8425c216b93fa73d16acef2a59024
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its structure, containing mostly image data and a single clickable action. It leverages multiple external URLs, suggesting an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 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://huntic.ru/uplcv?utm_term=episode+how+to+get+gems
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/firuxibufa.pdf
    • http://reckdance.pl/userfiles/file/fogibunogeniverepav.pdf
    • https://robert-zauer.cz/userfiles/file/61874270804.pdf
    • http://atomiccm.com/userfiles/files/kobebifezuposegaxat.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/viwakagazesi.pdf
    • http://ddaengshop.com/ckupload/files/xejifiditalubonisuv.pdf
    • http://adbrf.com/files/fckeditor/file/103819766361466c8e7e9f2.pdf
    • http://galerie45.com/userfiles/file/noroga.pdf
    • http://hotelamadeustorino.com/userfiles/files/budaf.pdf
    • http://helix.chuing.net/mai/ckfile/files/85891678708.pdf
    • https://cityface.cz/res/file/78639271117.pdf
    • http://af.ssla.ru/images/fornews/files/66498485259.pdf
    • http://elitvorota.ru/f/file/79000471482.pdf
    • https://suncables.co/images/file/xugejoloji.pdf
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/88184529186.pdf
    • http://moscowfashion.net/content/xuploadimages/file/27717750360.pdf
    • http://topflexsports.com/uploads/gatogufijepusalemuwef.pdf
    • http://tele-klass.ru/i/upload/files/82918230076.pdf
    • https://jin-hung.com/userfiles/file/weretapegalutoxasarapepe.pdf
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/zexodaxudo.pdf
    • http://ndt-ultratech.com/files/fitinobasiduzaguvevi.pdf
    • http://denge.aero/upload/files/77537300640.pdf
    • https://heatingboiler.ca/fck_upload/file/fafogimipurevaga.pdf
    • https://micsys.in/userfiles/file/denugasofuwesiwikewobejow.pdf
    • https://autoprofi.ua/userfiles/file/fusalatoreliwikepipolaz.pdf
    • https://bakotech.at/uploads/ckeditor/files/87503089541.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_off0000b128.bin
47f8d0bdfbde4fcdaaf8de262e139b6a3856edd9c98e7d01bdfbfb4df50b4444		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB128 14432 bytes
font_01_sfnt_off0000d536.bin
06032d23d65e382feae668c545d97593b5de3180d66dbc962753ef981599fee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 10496 bytes
font_02_sfnt_off0000ecf3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 16792 bytes

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