Malicious PDF — malware analysis report

Static analysis result for SHA-256 85062ae1afb3b731…

MALICIOUS

PDF

66.4 KB Created: 2021-09-30 15:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eabf64ad9be002cd36c6b87caf46da8d SHA-1: 6dc5d8882a4fe0cdc5a132afaf91049c5d4ba9da SHA-256: 85062ae1afb3b73190cdaf6ce990d02cc1c5e6690a29901895a96c43ab87fee5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as an image-only lure, typical for phishing campaigns, with a high ML classifier score and ClamAV detection. It contains numerous embedded URLs, many of which point to potentially disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be a screenshot, reinforcing the lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 66 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://weeb.nu/userfiles/file/34715699931.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/28590636448.pdf
    • https://www.aukuras.org/ckfinder/userfiles/files/96942528608.pdf
    • http://capableapp.com/uploads/files/rogiwaku.pdf
    • http://wasserentkalkung.at/ckfinder/userfiles/files/20986812939.pdf
    • http://skolicka.eu/foto/images/file/91644921353.pdf
    • http://danieldesignpro.com/userfiles/87920011249.pdf
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/56614224817.pdf
    • http://vektor-bezpeki.com/userfiles/files/pakamitixij.pdf
    • https://h1t-url12shio-turbo.com/contents/files/punupe.pdf
    • http://nhasachthunam.com/upload/files/xitaridoniratel.pdf
    • https://pachetedeturism.ro/images/files/35198372181.pdf
    • https://hot-pol.com/images/file/78456851204.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8cb5fe6e57021db7f4cc52913ef6ad6/99965852659.pdf
    • https://www.campacinter.com/image/upload/File/72636921608.pdf
    • http://infoegrafica.com/userfiles/files/sabunofigok.pdf
    • http://avandcie-energy.com/ckfinder/userfiles/files/98053088408.pdf
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/nusegokubujam.pdf
    • http://dekogard.net/deko/veri/_files/96892540127.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=vidmate+app+android+old+version
    • 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_off0000a910.bin
e027469ef9c58d862c6b35fc36a8ecabd0c6f975c0d638c008af4fc07c023c4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA910 14188 bytes
font_01_sfnt_off0000cc68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC68 16792 bytes
font_02_sfnt_off0000e47f.bin
f952d065e582bdcca64852dd9fc8489163edfe141a95853790962a69f8f42dce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 10588 bytes

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