Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6f65eb80fe00c3…

MALICIOUS

PDF

86.5 KB Created: 2021-03-22 15:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c275328ae6b4cc06960049c2abfcd30e SHA-1: dc9ebe7b83b5ec057ed96feeafb3864ac87dd83e SHA-256: 5e6f65eb80fe00c302e7a7050e3c92df35b458904ea784edc375844e96183472
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'bologen.ru' which is presented as interview questions. This suggests a phishing or malware distribution attempt. No scripts were extracted, but the presence of external URIs and the link farm heuristic indicate a strong intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=interview+questions+and+answers+for+music+manager PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444374/normal_602e112992528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_6054366c82856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469824/normal_6024fccea00f9.pdfIn PDF document text
    • http://deflecfcvy.best/gevubeguro01m07.pdfIn PDF document text
    • http://honbiz.pro/60909744558twnwe.pdfIn PDF document text
    • http://trokot-tonirovka.online/blue_colour_images_freejcyy1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481067/normal_603928d25f0b7.pdfIn PDF document text
    • http://trysalon.xyz/207287435973wzo8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_4945d422d60646c28dbc01414c9d5d31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/how_to_explain_composition_in_photography.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/23716500842.pdfIn PDF document text
    • http://zipemoluligera.myartsonline.com/tosejadanavemevebonaxox.pdfIn PDF document text
    • http://telifujovemevo.atwebpages.com/ielts_liz_reading.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/chellame_song_masstamilan.pdfIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_8ecb6d4d2103474eb6cfe2008393c03c.pdf?index=trueIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_d7da589ec74f4ca1a22e921915a2eb89.pdf?index=trueIn PDF document text
    • https://6e6ad6c0-90f2-4367-a025-4e24aeda1d0e.filesusr.com/ugd/c9b7fc_190ea97312e94c808e51497e2953d30e.pdf?index=trueIn PDF document text
    • https://a539eca0-ed6d-4e39-a9fd-63162facd464.filesusr.com/ugd/8170ee_08c572a6219240b59197ee00039ce4e8.pdf?index=trueIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_5781e0b9d13b495596d7722294e3c4ae.pdf?index=trueIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_176ae30f49b84dff96cfbd6c55cd4f7f.pdf?index=trueIn PDF document text
    • http://jibimom.myartsonline.com/59159449689.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_off00011680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 5524 bytes
SHA-256: 1841e380a29e4f71f5702f582e4dbe8fce8e827e6b6dab314e9adb4e10242db5
font_01_sfnt_off00012945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12945 10696 bytes
SHA-256: bc8037fb6dbb3ab1f74827e2a738f71cc2d30bbe3a42f6a42466c5cd9a953b57

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