Malicious PDF — malware analysis report

Static analysis result for SHA-256 5649c0c55c933952…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 16:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9b9a079f5a274738f59190d9ddfaee7c SHA-1: 0b1fd42a0fe1d76d3c68755e812301868f7bc465 SHA-256: 5649c0c55c9339529e82815e7caa377c8439e85251c0218a4a8406f0cac1c39c
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains numerous links to external PDFs hosted on various domains, many of which appear to be disposable. The 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of distributing malicious content through link farms. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic of encrypting payloads, which is often used in conjunction with phishing lures. While no scripts were directly extracted, the nature of the links and the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://currycornersugarland.com/admin/images/file/purevuboxet.pdf In PDF document text
    • https://congtydaihai.com/upload/files/givuvadazazudukupujetofil.pdfIn PDF document text
    • https://vendax.ro/files/file/96560062911.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/97504908329.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/nomedemasavodowamedaja.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/22324135263.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/jemegunux.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210910065204.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210906085057.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/figipofexanakuwekazimoga.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-04-15-32-09-53.pdfIn PDF document text
    • http://calienglish.com/ckfinder/images_store/files/67950879022.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/90445768065.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/9a71be22122c82cf8ce75806aa0592d1/pededujigunu.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/tadufimiwape.pdfIn PDF document text
    • http://novichiha.ru/pic/file/nagijudirosuzelexusupo.pdfIn PDF document text
    • http://nfc.soo.jp/file/dafagijuxas.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109020225146818.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/mefurowakamulamupo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6f520469---rirajepimopopese.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/33005977988.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/61357100341.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/35988999942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=btinternet+login+pagePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E5 10312 bytes
SHA-256: 48ba2c389bb98f37dc034e2093c26494e889d16d1e1d84684c140a25ee7cdb2e
font_01_sfnt_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 16980 bytes
SHA-256: 2fec60d5a20514e3ed169f209395c1b75e38e695414d603663af7551906e18dc
font_02_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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