Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61b830721546005…

MALICIOUS

PDF

80.5 KB Created: 2021-02-22 07:19:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a5515243379702a0266b2bf647505be0 SHA-1: b07df2cd248f69389e6dc5dd14d055009760d1d3 SHA-256: b61b8307215460058ec7f8cc6d0f795efbfba564fed12e50eb0528ad435c3547
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. This is a common technique for SEO manipulation or to distribute malicious content. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/123?utm_term=peavey+classic+50+410+vs+212 PDF link annotation
    • http://domavera.ru/46620934227ganv2.pdfIn PDF document text
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/xutotasidux.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/jiaghjc/gorasigoredanidojaruxom.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/eVUjcia/rewinegaxaziwida.pdfIn PDF document text
    • http://help-copyrighteamservice.com/online_convert_csv_to_vcf_formatq6f73.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/cLsB1an/45657765520.pdfIn PDF document text
    • https://vaxunupix.weebly.com/uploads/1/3/0/7/130775436/6501288.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/niepkjb/robbery_game_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/idkhhbC/social_emotional_intelligence_definition.pdfIn PDF document text
    • http://abwaab.su/dmarc_email_report0ox53.pdfIn PDF document text
    • http://bejuzoz.iblogger.org/aradhana_all_songs_pagalworld.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/ggiL1ii/69780397597.pdfIn PDF document text
    • http://tehnikator.ru/military_college_jhelum_admission_form8035y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jebejabekuja.epizy.com/23095688062.pdfIn PDF document text
    • http://lifanijuw.epizy.com/gapepatujoj.pdfIn PDF document text
    • http://retukazitoja.epizy.com/zetapibowizulusamob.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_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 2940 bytes
SHA-256: 72b815926571ed76dcdb15ba0f925f8be737f518649be50e3ea36e0fc125b231
font_01_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 5396 bytes
SHA-256: 16330b876f6fe51289d9889b3f7a1849e70a8be58be26e115f38bb4b2e25f1bd
font_02_sfnt_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 11216 bytes
SHA-256: b51aeb6f808acfa1f255911b5d2864dad8a5bfe266b4688bd55ba6ee1842c705
font_03_sfnt_off00012000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12000 16060 bytes
SHA-256: 9044de52cb519c95ee67ddce32ea384e940c5cdde4d4dd99e22aebcefe2ca402

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