Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78a5117b9b3997c…

MALICIOUS

PDF

80.5 KB Created: 2021-05-05 12:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 53e79f4f3a6eb304c3e598a9f83acb16 SHA-1: 82db97d43f0e9bb0490934cdcd2aa33103206a90 SHA-256: a78a5117b9b3997cf36fa995b1cab29e312e4cd3b14427b8bbb645c9b8f5f227
226 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which point to disposable domains, suggesting a link farm or phishing operation. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common technique to trick users into executing malicious commands, likely to download a second-stage payload. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://zajinet.ru/strik?utm_term=dos+command+list+files+older+than+date PDF link annotation
    • http://jixapijojuxev.iblogger.org/1_ml_de_etanol_a_gramos.pdfIn PDF document text
    • http://tonerinkstore.com/73794421871ptxf3.pdfIn PDF document text
    • https://bexukisutiso.weebly.com/uploads/1/3/0/8/130873741/zamugobizafaditebi.pdfIn PDF document text
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/nadobijawedirolevis.pdfIn PDF document text
    • https://kepigepejabuji.weebly.com/uploads/1/3/4/3/134315220/fea03.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/xukowexugatam_rurufinosidaja.pdfIn PDF document text
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/kemipikadujosasusi.pdfIn PDF document text
    • http://gufutaca5.xyz/92941494818hmy1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d9d52f-91c9-48d7-8aaa-27c48df62306/34177174582.pdfIn PDF document text
    • http://fuzesezetigogum.epizy.com/48471340322.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_be220abb979b4bd28e4627bcfeab6ce5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5977fef1-0bd3-42bf-bd1b-a689193402a4/66495285175.pdfIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_e161bc5ad04046509472508481f1689f.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_ce51f1d170ef4131b9cb449f5f8312ea.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_42fb34af5925473ba56f79daa09e622b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc73640-bde6-40b0-815c-ca36566a2d23/commercial_bread_cooling_racks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0479bd0f-e711-48ec-afab-c969c2558841/organizational_culture_of_google_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0efd8ca7-a7e1-4117-9d6e-bf66604ddd7d/62353454569.pdfIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_ff2d8fb067d84094a0a4e4891838dcf2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b09eed3-075d-4b86-a65d-27f8f046a2e2/nicomachean_ethics_second_edition_citation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ec1116-303c-4a35-8b65-ef5516afa402/possessive_pronouns_exercises_for_class_5.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 5260 bytes
SHA-256: 28a80fe1005087967bd146eb8f3869c440ab42ec65025512e694e849e4a4eaca
font_01_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 12800 bytes
SHA-256: d7fd02aae925ed6869ffa9c43e9e6ce720c04cb964269caf762fc32250fdd1a5

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