Malicious PDF — malware analysis report

Static analysis result for SHA-256 236654aa49956883…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 11:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c702401e49e13cb783231d6d049745ac SHA-1: 064d85b07a1e0ee85a944d821d9acfca5b250db0 SHA-256: 236654aa49956883f8a19a47088fecc68992977b2d325a40e9649a0f2103a6e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a tactic to obscure the true destination by using many distinct hosts. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://specimport.by/files/files/nuzedevojiboxus.pdf In PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/78236766066.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/13474245157.pdfIn PDF document text
    • http://tano-cable.com/d/files/62474828235.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/mepuruxoxemikipusu.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/65934858250.pdfIn PDF document text
    • http://kechengchem.com/upload/files/96828348145.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/sebigiluwuxarudagepokegu.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/5575459820.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/vapiwegewul.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/kosavojifoturivupexa.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/safojixezikamoxax.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/vaguvowojemas.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/lufugufufafalubaluwo.pdfIn PDF document text
    • http://oodow.cn/upload/file/210910190127973679z9roa42v7mdt.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/razilebuwunawamefa.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/82164632368.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/24393697513.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/39059b8a887b1126d507c33ef1b15b86/72291887594.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/gewisizenetaravepisir.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109030602323455.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b87a3de0c5---48229777060.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/31400914648.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/14614019073.pdfIn PDF document text
    • http://kco.su/userfiles/file/korobaxigolufeduk.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/kixoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=openload+movies+ukPDF 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_off0000b358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB358 10640 bytes
SHA-256: 659e6093a20fcb68fd95097a13e2c378bc9ebabcc3e476a8b97655b812428559
font_01_sfnt_off0000cbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAA 15272 bytes
SHA-256: ee3160053a53122dcbb0011c877766038355c5f1127765ba2c3db0554f46ccf0
font_02_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1