Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b27739683e151eb…

MALICIOUS

PDF

76.5 KB Created: 2021-05-07 06:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: df180d6113904ad0d126b19373154cce SHA-1: 42a5db37954199c554e5d548531673992a4a7ee7 SHA-256: 4b27739683e151eb8f4bcff126484af8af4e5363456e8e4286b59212d2864a0b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and appear to be part of an SEO link farm. This is a common tactic for distributing malware or conducting phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=casio+ga+100 PDF link annotation
    • http://varnisvakq.ru/evinrude_18_hp_fastwin2sbuw.pdfIn PDF document text
    • http://rankingcoach-seo.com/53904359574w9rqg.pdfIn PDF document text
    • http://opendouche.xyz/what_is_node_in_finite_element_analysiswpw3y.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/ji8blha/pidug.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/Rejfpgf/crew_notifier_app.pdfIn PDF document text
    • https://ruwufinojib.weebly.com/uploads/1/3/4/6/134643146/a1543.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/jauibij/story_downloader_instagram_hd.pdfIn PDF document text
    • https://powudeli.weebly.com/uploads/1/3/4/7/134772307/lugotazimomig_xofulibipabe_sadigu.pdfIn PDF document text
    • https://gorelafuxom.weebly.com/uploads/1/3/4/4/134497365/9b08395.pdfIn PDF document text
    • https://wosixuluwur.weebly.com/uploads/1/3/1/0/131071196/resubop.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/turexadovox_jededaded.pdfIn PDF document text
    • https://gubagomokugexat.weebly.com/uploads/1/3/3/9/133988684/4675d.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/fijij.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/sarolesanusejidanazosi4wv1w.pdfIn PDF document text
    • https://xafogijarusa.weebly.com/uploads/1/3/0/7/130739817/3221133.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/giHijqr/jubugeramigadujinu.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/xmpJchh/journal_of_financial_data_science_impact_factor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_0c69040ab6ee43d584fc4ccbc75d9848.pdf?index=trueIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_ffe0a5f3290a4beb83bef87ea16a0d2a.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_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 4824 bytes
SHA-256: 7fd7f3904adbe60b0f708de830d6c5da6f2e4ee597131d21c331d8a75c45c43c
font_01_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 11560 bytes
SHA-256: 680b47652907ac90c832c833870b8abe7a48e116a65556335c039219de1b8293

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