Malicious PDF — malware analysis report

Static analysis result for SHA-256 c782b7c75a90e7c5…

MALICIOUS

PDF

76.5 KB Created: 2021-05-31 21:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 127c9adecb44ea2c80465c080816ded5 SHA-1: f9e8e20d633715ff1f9d39423375e2b8d7e7774c SHA-256: c782b7c75a90e7c5ab51f61acfe3ec0907e80dc04413b8f21ab5132641cf78f9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://botokaw.ru/wb?keyword=first%20alert%20carbon%20monoxide%20detector%20manual%20co400', is embedded within the document's content, disguised as a manual. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wb?keyword=first%20alert%20carbon%20monoxide%20detector%20manual%20co400
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5ff96f05140e1.pdf
    • https://cdn-cms.f-static.net/uploads/4461485/normal_60485840b2a6a.pdf
    • https://zemovawid.weebly.com/uploads/1/3/4/6/134608463/899de548c3c08.pdf
    • https://bowalizixoled.weebly.com/uploads/1/3/1/8/131872289/7158467.pdf
    • https://rujogapojepon.weebly.com/uploads/1/3/4/5/134597846/9890965.pdf
    • https://cdn-cms.f-static.net/uploads/4379043/normal_5fd98040533ec.pdf
    • https://vozexipazaxa.weebly.com/uploads/1/3/4/4/134444785/3720080.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dbb6cedf-2cdd-4023-8d71-962eed1ec952/1120059649.pdf
    • http://rugewenuzed.pbworks.com/f/paxuz.pdf
    • http://nunaruribeg.pbworks.com/w/file/fetch/144411669/how_to_find_gmail_account_location.pdf
    • https://uploads.strikinglycdn.com/files/f71d04bc-7f09-487e-b151-94fa86e5f525/active_voice_translator_passive_voice_online.pdf
    • https://uploads.strikinglycdn.com/files/e0f1d7c0-a5ce-4eb7-9349-558b6f2aa6ef/7470838497.pdf
    • http://kufujibumufa.pbworks.com/w/file/fetch/144413400/calidad_productividad_y_competitividad_deming.pdf
    • https://uploads.strikinglycdn.com/files/e50e0798-ddbe-49f9-a027-2c45dda03474/how_to_assemble_h2o_mop_x5.pdf
    • https://uploads.strikinglycdn.com/files/c8dbc74d-0195-4126-8636-3c52d4ae9541/pomolovo.pdf
    • http://tagexoba.pbworks.com/f/wivesamufax.pdf
    • https://uploads.strikinglycdn.com/files/512f6b9c-1295-47bd-93fd-cccc807f9551/john_deere_x360_issues.pdf
    • https://uploads.strikinglycdn.com/files/b5f53c96-13ef-435d-86ea-06519e980f2d/badodilemupali.pdf
    • https://uploads.strikinglycdn.com/files/2303f0cb-3922-47b8-8410-8ff07032b60f/excel_2010_vba_msgbox_yes_no_cancel.pdf
    • http://xedidovetaw.pbworks.com/f/what_do_blue_tongue_lizards_like_to_eat.pdf
    • https://uploads.strikinglycdn.com/files/4d338685-e0ae-47b0-a3a7-c57429512200/is_trading_worth_it_elite_dangerous.pdf
    • https://uploads.strikinglycdn.com/files/5fc1451e-421c-4366-9b36-7dea1d412917/why_have_obesity_rates_increased_so_dramatically_in_the_us.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea1.bin
99362f490d813dc4a9b3e5e01eb9f17fc3a260cf6b272e6b62c15333e296d7a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 5476 bytes
font_01_sfnt_off00010133.bin
f043f7632ba687bb5beae154cb3b400f3f16ad71b9448cd0bcb846b042405095		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 10372 bytes

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