Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a91179263d37f6…

MALICIOUS

PDF

80.4 KB Created: 2021-03-15 16:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 967901c856a7d3fa95b6920c905257ec SHA-1: 753b6593a6232c63901ef6e9e9f66ee03524138a SHA-256: 58a91179263d37f6c06eef3b575bb9b3cc94ecf2005bfebcdce85fd0ecc9b601
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with one specifically identified as a potential phishing lure related to a service manual. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of many links on disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=rotel+rsx-1055+service+manual PDF link annotation
    • http://rubolanir.mypressonline.com/37694495696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_603cb3f04f3b0.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/viwejagawatenivotedud.pdfIn PDF document text
    • https://cdn.sqhk.co/bidamasegom/gdwHOig/7284632038.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/Qgeahb7/kobibixaxafitigidi.pdfIn PDF document text
    • http://minosijasif.mypressonline.com/kwikset_smartcode_916_programming_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462339/normal_5ff6667529e95.pdfIn PDF document text
    • https://cdn.sqhk.co/timafewa/bUIDE5D/pibebupumubapogokufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477864/normal_5ff526f63eda1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414867/normal_5ff68893ce203.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/excellence_riviera_cancun_menus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namezenidel.onlinewebshop.net/biological_nitrogen_fixation_mechanism.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_4f734a3b876641ad96a82bc8e4afe341.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_9ff406f5966042eab7acb3a2230165e1.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_8c91c55240264547bdf033e216266411.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1722128d-19be-4c09-a9f8-24c8523911e1/my_lg_washing_machine_door_wont_open.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97630cf8-0d5a-4dba-9683-a4c9a0d1aa0a/69833338359.pdfIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_4e218160101b4ab5aaad8830d9b3df03.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_f066d33d2e6641008714f42176f356b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/079d1c79-0f92-4b9f-80f6-133448ebfeab/57036409558.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_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 5432 bytes
SHA-256: 71f65775514a9d1e606d63a89f65c4deb4b50fdd7c216c06c839a25332c60044
font_01_sfnt_off00010bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB1 11672 bytes
SHA-256: e40afd2d432e154a8550e17565e4a4c619dd04daad86677298cfd17e324e187f

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