Malicious PDF — malware analysis report

Static analysis result for SHA-256 f136b0fef3f33906…

MALICIOUS

PDF

84.5 KB Created: 2021-03-20 22:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4694fd6605d7900d7a1cd749ed3c058b SHA-1: 995fd9f90452f39f59fd367bc6b41bb2d8f54096 SHA-256: f136b0fef3f33906663ba5d9368ae53a0f53216edf60cf1e80f49b7a1fc99170
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9995

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://mezovuduw.ru/strik?utm_term=the+talented+tenth+summary+sparknotes PDF link annotation
    • https://cdn.sqhk.co/disanefamu/Sidgiid/motitab.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/hcYggBX/75374733199.pdfIn PDF document text
    • https://cdn.sqhk.co/fogizotufijo/CgjAifp/picture_composition_for_class_2_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/wafexumu/jdiibtq/exorbitant_in_a_sentence.pdfIn PDF document text
    • http://lazotub.mywebcommunity.org/antigravity_muscles.pdfIn PDF document text
    • https://cdn.sqhk.co/xuteposidobi/hdgcuje/xevomisoverofimixufojosut.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/56206669520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485939/normal_60159c814fa4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482218/normal_5ff16032d8217.pdfIn PDF document text
    • http://putifid.iblogger.org/49458587665.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/joterige/36009486790.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/90237795363.pdfIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_cdc73fc1bf534185b3aae0e74655029f.pdf?index=trueIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_83ccd53ad6a44ced80fa9a91dee16b93.pdf?index=trueIn PDF document text
    • http://xokifanubede.rf.gd/what_is_the_correlation_between_hermeneutics_and_interpretation.pdfIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_4b522caa94fd48c588de9d5156e0c53d.pdf?index=trueIn PDF document text
    • http://pegesij.rf.gd/byproducts_of_oil_seeds.pdfIn PDF document text
    • http://jaminuzifibe.onlinewebshop.net/56386158596.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/18920174270.pdfIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_4396de7e1b814931b2cd3cda7c5090c5.pdf?index=trueIn PDF document text
    • http://labeberop.epizy.com/periodic_table_basics_worksheet_answers.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_ef9934eaad11486c80327379c340ed77.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 5148 bytes
SHA-256: 2160fbbf1c4b7fb82908eaf0cc5863971f6b68abf878e84a528afce3583163d3
font_01_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 11088 bytes
SHA-256: 4916f965e0f8637dd9dd423ade86bdeaac2cc4f301147be1b66b2fbc3bddff80
font_02_sfnt_off00013618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13618 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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