Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3b69a16bab44f3…

MALICIOUS

PDF

80.2 KB Created: 2021-04-18 23:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 72d4c9abb4deb85f9d7b868d3aee60ae SHA-1: d8f9b99141f5ba02968c702d6a74ba25e6ddf37c SHA-256: fb3b69a16bab44f31a979f6257879175f7de3ae05adf5dfc5fe210f611786bea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://crophysi.ru/strik?utm_term=iowa+code+chapter+232.147 PDF link annotation
    • http://idem-peshkom.ru/jiveditapuxukefiwanobud6og.pdfIn PDF document text
    • http://kezosod.iblogger.org/ram_dass_documentary_2020.pdfIn PDF document text
    • http://labozozirakeko.22web.org/sezufiv.pdfIn PDF document text
    • http://baffer-shop.space/kajadajam3ci9.pdfIn PDF document text
    • http://naturebiolog.space/bamadomapolelovugulasone1oxs9.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/soul_music_blogspot.pdfIn PDF document text
    • http://hookup154.fun/ruger_mini_14_ar_15_magazine1wj6v.pdfIn PDF document text
    • http://ukrinsure.com/30161351404qnmc5.pdfIn PDF document text
    • http://nujilojubixub.22web.org/how_to_start_a_dishwasher.pdfIn PDF document text
    • http://strahuemsya.info/jovusidihpxdd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_2fb7bd6a495948198fa93d5ebaefd4cf.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_19ad265427ea4ff6af127ca6dbde36ff.pdf?index=trueIn PDF document text
    • http://dasuxasad.rf.gd/the_48_laws_of_power_robert_greene_full_audiobook_hq.pdfIn PDF document text
    • http://nusorilafezevi.rf.gd/64193737785.pdfIn PDF document text
    • http://pemeromerap.rf.gd/game_theory_applications_in_network_design.pdfIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_a25380ec2b824dd8b8fa7acb29b34579.pdf?index=trueIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_44893527640b43c08c8e0edd6832719f.pdf?index=trueIn PDF document text
    • http://benosubageratiw.epizy.com/human_genetic_diseases.pdfIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_ba0a380618cc44b09f791159e8ce33e4.pdf?index=trueIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_6eb36ca8477a45cd88f560907591d408.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_a3abaac0eec04494805f5407c4307d08.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_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 5528 bytes
SHA-256: b0f93e92887c4019b26e0e0310dfc052a6fb531e9fabba1f0b22d6db922faa03
font_01_sfnt_off00011137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11137 10188 bytes
SHA-256: 434d67c1322003777adc59771380762c52c5dffde341e173e5abaf9d96503997

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