Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6935cd8e4222b1…

MALICIOUS

PDF

81.1 KB Created: 2021-04-23 03:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 00acae3f9677ae9e8d9089b716fa564a SHA-1: 533a1462cfd9c7ce12c38be8ab895d9b412e24e2 SHA-256: 3b6935cd8e4222b18344e39c9708d5da478fdd7d46b8024500ac6774bb854471
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 0.9998

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://maypoin.ru/strik?utm_term=kiss+the+rain+piano PDF link annotation
    • https://cdn.sqhk.co/zexupibo/hggjiim/47470328917.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/jfgiehh/72239146024.pdfIn PDF document text
    • http://xikimubixod.22web.org/loxixenozefimuwepobox.pdfIn PDF document text
    • http://vaxakunuxabuga.22web.org/woluwipaputuge.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/OwulifI/automaton_definition_thesaurus.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/hhheMZ5/origami_heart_envelope_step_by_step_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/IidkhbU/light_up_christmas_wreath_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/1hdgdO3/16075638941.pdfIn PDF document text
    • https://pezefipagezag.weebly.com/uploads/1/3/4/8/134883300/rudikunole_kumele_ritubok.pdfIn PDF document text
    • https://dozadekexojigig.weebly.com/uploads/1/3/4/0/134096874/3949925.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/UiaFijv/fear_the_walking_dead_wikipedia_episodes.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/1jijd8T/simegexemotafitiwuvupejuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_46bc8cb2fe9a47ab841f3fdf7edae2eb.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_9c686aa360d94d769c65fb0aee362926.pdf?index=trueIn PDF document text
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_970b01833a4f456aa8fd6602dc9d4b2c.pdf?index=trueIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_6e060c4910274e10ae0c84a779ba3cc0.pdf?index=trueIn PDF document text
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_5db476aa706346208bb5f50ff0a22349.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_e4bdafc2ef284c169ee1e19209f72274.pdf?index=trueIn PDF document text
    • http://bapaxofobawob.rf.gd/catalogo_avon_17_2020.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 3136 bytes
SHA-256: fef4e17f5a199cae665f88d2391b7065b6124126c5f666acc732863ab42ca84e
font_01_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 4844 bytes
SHA-256: 0060a99caa97603c7b880f02b461d326dcbe6ec987e251c6720543a0916bdd41
font_02_sfnt_off000110d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 11440 bytes
SHA-256: e7eac14242a9f1f4698295310fa736859a93707af73585938305bcf9530ca023

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