Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7ce11c9f8d9d10…

MALICIOUS

PDF

78.3 KB Created: 2021-03-07 09:01:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 14c477c3a302e72a8d062ae46a3ce9ee SHA-1: f7662dba8d12d88ed8923bbe9a2a99caa462dafb SHA-256: 7f7ce11c9f8d9d10a6e73eb72212a9a97e7069ca277cf180d63afe17c4a0ef02
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. One prominent URL, 'https://pelibifir.ru/wix?keyword=mr+valsas+math+page', appears to be the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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://pelibifir.ru/wix?keyword=mr+valsas+math+page PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454673/normal_5fe626438d606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387428/normal_6014692618bdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481852/normal_600e0fe6d66cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456114/normal_603047c8e911d.pdfIn PDF document text
    • http://pl50off.info/61452654586ct29d.pdfIn PDF document text
    • http://duplicwcnj.space/kudumuzepuvwf22t.pdfIn PDF document text
    • http://priz24.site/63081951117lhiky.pdfIn PDF document text
    • http://anyita.space/133628138759cd3n.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/69622608816mqoez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_12ac7815a57f403883dd0354c802b803.pdf?index=trueIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_a7627d3fc90f483ab4c28443dc86006b.pdf?index=trueIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_3a6c5ade8f514717a9b0884b1d31b4fe.pdf?index=trueIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_4853306f9211478c9cc8e24c9df17343.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_5b06c5dbc7d24c6197e524f9cbda3f19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/best_prezi_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/badezonabefatoparori.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_28def2b570ad4360ae3b495523f72d69.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pipaneku/whirlpool_water_softener_parts_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/disgruntled_former_employee_definition.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_c4861263f5224b3183fbec426b363bae.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_9a005e9dfcf4420486467824ec0f23e1.pdf?index=trueIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_ac7baeb16e704d4ca2d2e937ba7b4084.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_15297940be99431792b9ddf8a5e2b30c.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_c85666b368624bf5a591d9c2a803bf35.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_b5d5d42a77f44edc921cd5bb74a7692e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutogugej/papeduvemuvekebabo.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_f3a679a1c9c3419ea3771be958072d22.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_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 5296 bytes
SHA-256: 0ad2d8c9631e129453732c8c05c0d9ebfddd50f4264715594c8395423d0d57a2
font_01_sfnt_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 10112 bytes
SHA-256: 7ddd6d639903cc9683442987935d3fa4b10f29a106b811f2e4c2901d932e3a35

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