Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf9fbe73a08ec3e…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 17:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d07cd5852ff73606b26b94355d2603f6 SHA-1: 412bf3be61be1b3f27b98a85bd30a74aec0bc409 SHA-256: bbf9fbe73a08ec3e2bf3189c59583fc94baf4f33bf384f2abd161a3de2c86e77
206 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=no+puedo+activar+el+wifi+en+mi+tablet+android PDF link annotation
    • http://theheavent.com/userfiles/files/lixokugufitesisan.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/gomopekivuperozuzonevu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/88533983716.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/eb50db3f738b22c38e4fbeab9160dca0/98000596344.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/52427088178.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/59376786390.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/83105853472.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/kazataboponazulajiti.pdfIn PDF document text
    • https://mytopics.it/uploads/file/pazuf.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/zututetelitikapaw.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/duxuvibawepezelovalobuvu.pdfIn PDF document text
    • http://eternoohydro.com/d/files/134090564.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lajalumakenu.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/21651175530.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/20760944273.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/xodafivosepomuvewujowi.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109081855448860.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361019c4f2c---mirib.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/jivom.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/rituwutifijarovizamekulo.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/96493007805.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/80620301159.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/32968832853.pdfIn PDF document text
    • 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_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 10984 bytes
SHA-256: 4f606714bcc3baab14421b8dcc5a46fcc29cbaa1b97e7c2e76f4b09895c75568
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 19140 bytes
SHA-256: 5f5f8691e69c2925ca7e1d6d83f0f65d62b73f877dbb9b98a9522eb5e974ee6e
font_02_sfnt_off00013467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1