Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9d87d1ae8641eb…

MALICIOUS

PDF

75.6 KB Created: 2021-09-19 03:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3cf2c643b0a3866c9f14d278195d1e6 SHA-1: c6bd7a670d133bf5ab816b3158f9a0805bc307e4 SHA-256: 2a9d87d1ae8641ebd72d5b9079f1c3022d39e026885c9231b12d8de3e56a1dae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by multiple heuristics, including a medium-severity rule indicating it's a link farm on disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://pferdplus.at/sites/pferdplus.at/files/file/41957380143.pdf In PDF document text
    • https://etcbt.com/userfiles/file/82665913030.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/laxajisodilupena.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/zebolufofud.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/dasowibozikegabu.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/wetesidumedopuguxes.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4bfa12bf4---70332247825.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/16953793206.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/91666565368.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/11948783237.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109012132523026.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/141221394959.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/jodomonifadijaruwovoli.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/43720152568.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/91616892131.pdfIn PDF document text
    • http://fygl.net/uploads/file/040412585408.pdfIn PDF document text
    • http://sbcnepal.com/images/file/wilexaponowisiginolotoj.pdfIn PDF document text
    • http://ubest.ru/images/file/72250858155.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/situmexeku.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/dakizerefijuz.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/4f9f7q8a11ok68crtgkamgnocj/biwapimetovusalupezejiti.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/48641695833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=outofmemory+gc+overhead+limit+exceededPDF 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_off0000c380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC380 11060 bytes
SHA-256: 209b4cffee0eb2fdef7cd3f53d776ed059528cb8426bc967ad9a2f7f65723c21
font_01_sfnt_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 16836 bytes
SHA-256: 5e60f794917a8ceb83d286cfcc1e4778eca46c6492e2584cae82baf0870c926e
font_02_sfnt_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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