Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb032e6b6dac68f7…

MALICIOUS

PDF

79.5 KB Created: 2021-03-16 16:02:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7c052ca7bff70f08bff49da338f2c0da SHA-1: 9832ce75f24a23e9161a5fc3bdfd7b019c2ad70b SHA-256: bb032e6b6dac68f7b130bfa33d30824717e7539a72bd61df5199bb77eb2bcb6b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=l+amore+al+tempo+del+colera+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387929/normal_6026443fd85ed.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/9850805.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/Fjhrie7/kudukezorejobekilipoje.pdfIn PDF document text
    • https://cdn.sqhk.co/lojegalivo/XbsicR9/71304988644.pdfIn PDF document text
    • http://kefitetapirep.22web.org/bokimudepikul.pdfIn PDF document text
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/jobiz.pdfIn PDF document text
    • https://cdn.sqhk.co/ganidabizi/h0mh5OH/81079572509.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461766/normal_6000bce936f21.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/susaroledi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448337/normal_6020d9795b063.pdfIn PDF document text
    • https://cdn.sqhk.co/kuretunaba/NJoWhdW/15814471212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454435/normal_6047dd31982be.pdfIn PDF document text
    • https://dirifulezidume.weebly.com/uploads/1/3/2/7/132740871/22947cb16ad9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_3e46231011e14e14937ce8110b97cc8f.pdf?index=trueIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_9541ef6de23240b0aeacdab5ca719a1f.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_33f05de2d68c478c93bf1b6d07908360.pdf?index=trueIn PDF document text
    • http://kowefejarozop.epizy.com/the_earth_crash_course_astronomy_11_answers.pdfIn PDF document text
    • http://malalepotim.rf.gd/the_entrepreneur_roller_coaster_review.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_99b7a33905ea42519999f8280910955b.pdf?index=trueIn PDF document text
    • http://xamazaxalezamat.rf.gd/4252623461.pdfIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_58d43964f0a543f991f293ddaa0da0ed.pdf?index=trueIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_b28a4e9218494b3eab6080a8dc62a668.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF671 5064 bytes
SHA-256: 5e6d10f104c750d3be808b6256740cbae455a590e5ea8c7157dd04905fc02692
font_01_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 12472 bytes
SHA-256: 89b71d46cf9ab809ad7ed31afeb8bc4d26ae538ecc02ecf0313f29d51bb170c7