Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca1652611636b2a…

MALICIOUS

PDF

69.2 KB Created: 2021-10-03 07:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bf0a10aa424a96134c9a5b3ab7c95153 SHA-1: befd7f0bae5c9dfdd6bcd973e6d40a0250a2ac8b SHA-256: fca1652611636b2ae47f5ffafbdb5041af69ae0f31363acc216a028f753a8ae1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, a common tactic for phishing or malware distribution. It contains numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 0 text block(s), carries a click-outward action, and is only 69 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://laborke.ru/uplcv?utm_term=political+theory+ideas+and+concepts+by+sushila+ramaswamy PDF link annotation
    • http://akvatoria.by/UserFiles/files/mezewasu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4d122602f781e4799e53715e1373d280/jiwoxafekuzuvitifebego.pdfIn PDF document text
    • https://geniodelweb.com/file/darekekikubolopi.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/paxotedirinuxezegogit.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/98425890772.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/patikewemavuze.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/pomujaloparegamef.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/57043414778.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/83441441645.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/zimevekovebiruno.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/fazezebaxubedodowar.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/bediwitataxular.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/41295445162.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/revekalukavevupo.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210923000521.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/gajirogafowixi.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/zudezenalofirazarilojixi.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/dasuxusanojikotu.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/bosatodiderabulabegego.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/12502127644.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/41346000489.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/62267251414.pdfIn PDF document text
    • http://unsersohn.com/images/file/67325442582.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_off0000b16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC985 11220 bytes
SHA-256: 57a9bbff75e44454c6ef16ac94ed40f8ef10cabea83b3606b0eb0e82730f1cd1
font_02_sfnt_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 14124 bytes
SHA-256: 3af42e1e28169163a6fe4851debef5aba2e5d08ed1600b6acdb9d31f8f418ce1

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