Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd80092c7a048ed…

MALICIOUS

PDF

76.0 KB Created: 2021-03-13 12:44:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 29d9d16cc677d36b9c162f4e45e289a6 SHA-1: 2ad1d0cdc09c7b1a1e13ff88ed60d62f10a44280 SHA-256: 0bd80092c7a048edf7009ed25e5d8950aa4f3fb4e93bfcd99e205ae70dd531c0
186 Risk Score

Malware Insights

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

This PDF document was flagged 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 domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure for sheet music, which is then used to redirect to malicious URLs like https://vilenefex.ru/123?utm_term=fur+elise+easy+sheet+piano.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/123?utm_term=fur+elise+easy+sheet+piano PDF link annotation
    • http://palitra-cveta.ru/etymology_of_communication_meaning6b2mg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450351/normal_5fcaecdbb9c51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478946/normal_60209a6dbce39.pdfIn PDF document text
    • http://natgood.space/49263072946te562.pdfIn PDF document text
    • http://cashfree.store/68908965842ht2am.pdfIn PDF document text
    • http://smartcoin.design/assam_women_s_university_admission_form35obf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426697/normal_5feb9a5687235.pdfIn PDF document text
    • http://2022god.com/12421089495u5pi2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_ee499d4b6e6f40a8b98de85abbde21bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ebfa977-7528-4c60-97b6-c5ed1519b168/honda_hr215_transmission_fluid.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_d24bba58447b48f98ed177aea5756194.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_4bf5f695ac1848debafe76f7d546aade.pdf?index=trueIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_d8c896b8463d45c18775c4a241abc02d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/782b7719-5611-44dc-b797-5bf14f78993a/fleck_5600sxt_64_000_grain_water_softener.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_49816904ff974853becdda6825080d85.pdf?index=trueIn PDF document text
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_6c16764c456e41a7be562e9a6fcfec1b.pdf?index=trueIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_4113814fd93b44b99118218dd02c2990.pdf?index=trueIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_cdbe4af0dd1e4745b9d39e26a765c6f6.pdf?index=trueIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_2659365cd0a14746aa508125a9113184.pdf?index=trueIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_af9e676b1b834e89855f33abf855bcc0.pdf?index=trueIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_39e29b44b1094178b8dcf40aef6a4c19.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_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 4964 bytes
SHA-256: ec0d67b3251a13f56a6b24911ca37e12bc24c940ccc753b1c5714a21befe0694
font_01_sfnt_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 10740 bytes
SHA-256: d592b90309fcfee975dc066a4569142a812678ed413c0ccba0a200840fcde481
font_02_sfnt_off000117f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 2572 bytes
SHA-256: 1391a2ce8e86a81dcea1ae520600e968aca936d467c2ae9fc3edb515ffe6ff09

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