Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44903e6b9d4841d…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 13:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9216b9a396be9d92bb32dad321b9bda0 SHA-1: 62d49633b882987ce8ba2a9e94216dfdeea95e38 SHA-256: b44903e6b9d4841dd3a02227e92b0cb0e2779d3af2f5df19b72d2d923aa70967
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/uplcv?utm_term=hulk+cheat+in+gta+san+andreas
    • http://casier-a-bouteilles.fr/file/51400775612.pdf
    • http://protok.pro/upload/files/mowexojifuxupiponuzabivar.pdf
    • https://abyway.lv/images/ck_images/files/zodulodegajesakirori.pdf
    • http://photou.cc/ckfinder/userfiles/files/zakujapebepanatutujomu.pdf
    • http://bertrandetgastineaudesigners.fr/userfiles/file/riwemazibalozemosarup.pdf
    • http://hongsung114.com/files/fckeditor/file/29120319758.pdf
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/memaxovimobajirelinuvedat.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613134f582ef5---kimubowejowomelop.pdf
    • https://xn--80aesyq.xn--p1ai/files/file/42614009835.pdf
    • http://studiostocchi.eu/userfiles/files/17199614904.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/wobedopunusud.pdf
    • http://alanaf.ru/userfiles/files/85501811790.pdf
    • http://protok.pro/upload/files/zaxanolokifizoba.pdf
    • https://farsiherbal.com/cache/fck_files/file/pawojoxipexu.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/watedatowopujuxiweni.pdf
    • https://lawyerupsmart.com/tempimg/file/82535057447.pdf
    • http://tries.cz/media/images/upload/file/farodipubidixovoxu.pdf
    • https://foodexgida.com/uploads/files/dunesovu.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/sd6so2irqqgn7c98u17j11utf3/98163355577.pdf
    • http://kleinschadenexperte.de/userfiles/file/zevusule.pdf
    • https://audreyheselmans.com/_files/file/kutorobagibinijowinadi.pdf
    • http://mebelhotel.ru/userfiles/files/44846250549.pdf
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/pipawinigebadenevewimetit.pdf
    • https://basalyemek.com/ckfinder/userfiles/files/fagamumomunugikobapekis.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_off0000b31e.bin
ea8d46cc7baa37a26de907af9b5be4d0720459fab3ba85c80f10dca396181235		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB31E 17168 bytes
font_01_sfnt_off0000df1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 16792 bytes
font_02_sfnt_off0000f734.bin
ca4222b9b2254fa2fbc5b4f306da8825bb3fc1a960a5e85c4a48991aa654442f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 10712 bytes

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