Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4ee343a6a0f769…

MALICIOUS

PDF

76.8 KB Created: 2021-09-09 18:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 177d4d68113452d194788cfdbd6d6319 SHA-1: 96c22b8e7eaff9b96f5d78e3b88f4ec4b83dc0ac SHA-256: 6a4ee343a6a0f769fb3259b71bc3f627bb93a880d15a95de722cbdb3359081e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://n-v-v.dk/userfiles/file/2697647054.pdf In PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/jalubuzofir.pdfIn PDF document text
    • https://huanghecables.com/d/files/tudajitasetotuvipumidava.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/78016784533.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/lonotugo.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/75649856700.pdfIn PDF document text
    • http://pinxedien.net/upload/files/sefosakosamixom.pdfIn PDF document text
    • http://hrudolf.com/userfiles/jojobifix.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/fugegixuwop.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/64087850585.pdfIn PDF document text
    • http://poliinc.com/upload/files/kepolenuwuver.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/xupojosenemawosomopib.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/zivaru.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/ramabobewapeva.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/delojixapuxipe.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ae6230119212872e7580605a9170dec1/konipupam.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/feduxowesimilom.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/xokodizonenadojowudojetu.pdfIn PDF document text
    • https://masihpt2.com/contents/files/mupusola.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/83347000406.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/34429992597.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/4603143762.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/35891906338.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/vefitad.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/50402734853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=video+show+apk+premiumPDF link annotation
    • 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_off0000c77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77C 10656 bytes
SHA-256: 75912acf919ceed62cd3ff6f330b62c2523cf77ae98ce16a71c4577703a9c4dd
font_01_sfnt_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 17700 bytes
SHA-256: 4e1660654f4703a7cdf7b415f3fbe04a3410c9f7b8e70fc5efa5b3d526413110