Malicious PDF — malware analysis report

Static analysis result for SHA-256 4283ddb0c5a58633…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 08:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 25673df88f1ddf3ab9b5378a4a0e3f3a SHA-1: 87b7a79388bbc22bb19fdff99a4c5a952f94728d SHA-256: 4283ddb0c5a586331a5cb2e174309af547306c1460e27cbd31cffb686ed5f188
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a network of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=daily+app+usage+android PDF link annotation
    • http://yuemeism.com/uploadfiles/files/wubute.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/11068362845.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/fepogimofo.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/lubowemibebu.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/93159552800.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/44168379922.pdfIn PDF document text
    • http://markone-tools.com/upload/files/72780575019.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/xiluvenosetotozewusato.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/38391964842.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/47798110849.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/24776702041.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/tuludoweruvono.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/nekipusametotid.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393f5115054---darifewasakivipumozapago.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/zonitanivo.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/1313680766.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/xudikatowa.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/depodewidoveluvaxixik.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/99118950087.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/197082011.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/8b2538df15b656fdcfc26a462b6ce5ab/23659870024.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/dixidobeler.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/13066318422.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_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B3 17700 bytes
SHA-256: b71f7dabcb937c616779bcf2dbb74359e2171f99592e80688703e800013251e0
font_02_sfnt_off000131d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D5 10684 bytes
SHA-256: 72efacf05082d3c88bc55ea0ce671e095d82e3f8cca99cf1ebb9d30b4c9a19cf

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