Malicious PDF — malware analysis report

Static analysis result for SHA-256 51242c46e99f5e39…

MALICIOUS

PDF

81.2 KB Created: 2021-03-09 23:24:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6af1b1b7ea42e09e612a7f0347c4850a SHA-1: b0f2f0fed3aa281d75c04237852e40b618a81b2d SHA-256: 51242c46e99f5e39561022d6f07d32d82a6c9470b7255a8f906e1bcdff61f0af
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL disguised as a game walkthrough. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence. The presence of embedded URLs and the link farm heuristic suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/wix?keyword=escape+the+prison+walkthrough+minecraft PDF link annotation
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/velenojisudak.pdfIn PDF document text
    • https://vosikobogoj.weebly.com/uploads/1/3/4/2/134235386/6254137.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499300/normal_5ff18042d899c.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesijoja/jaQjgif/18754326298.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/dibavexoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447467/normal_5ff0ddcadd1db.pdfIn PDF document text
    • https://paseruvuweduzuw.weebly.com/uploads/1/3/1/4/131437476/d834e7d14.pdfIn PDF document text
    • https://vugawijop.weebly.com/uploads/1/3/4/5/134594760/4566765.pdfIn PDF document text
    • https://cdn.sqhk.co/zitibidino/i7zgoRy/porupalesejuvovaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/equgglm/numerinebunovasowomadava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_600a1ec7d5ec2.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/who_made_up_the_third_estate_in_france.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/american_government_and_politics_today_the_essentials_19th_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nedijowewoded/the_pursuit_of_god_with_study_guide_the_human_thirst_for_the_divine_a._w._tozer.pdfIn PDF document text
    • http://tumitodutib.rf.gd/35229157460.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/fogejuzako.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/ana_gabriel_30_grandes_exitos_descargar_gratis.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/garmin_echomap_plus_94sv_livescope_bundle.pdfIn PDF document text
    • http://faruvesisok.rf.gd/bathukamma_songs_telugu_lo_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/webex.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/mugabadesoxofabefiwereda.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 5424 bytes
SHA-256: 7c64ef4e9aa2734ec1bec79e7cb2e60e4517f8b557901764cde524d7b505bc2d
font_01_sfnt_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 10720 bytes
SHA-256: 51f3ed1f786dd362e570852845d4aa279eeaf983ee3987d25f041e38f48156e3
font_02_sfnt_off0001141a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
font_03_sfnt_off000128e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2