Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6570a00d4da630e…

MALICIOUS

PDF

91.4 KB Created: 2021-06-08 02:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fbb6d888bc517c47a19287eee054e58f SHA-1: 92b94162ad4afe6d7a39475e2af409a6d83969ea SHA-256: c6570a00d4da630e3735c2e434c09852ed4ef6b0bee7fec3c5651d97b87bdcbb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning model assigned a high probability of maliciousness. It contains numerous embedded URLs, with one prominent URL pointing to 'synerhu.ru', suggesting a phishing or credential harvesting attempt. The document body, though heavily obfuscated, contains text related to 'persuasion' and 'wkhtmltopdf', indicating a potential lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/pbw?utm_term=what+is+the+central+route+of+persuasion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495854/normal_604503b72bbbb.pdfIn PDF document text
    • https://favimorujupufu.weebly.com/uploads/1/3/2/7/132710565/kekoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417220/normal_60146c2e558bd.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/disufopupijar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sazupamufode.pbworks.com/f/kazij.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/w/file/fetch/144510636/1977_honda_xr75_oil_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c7bd30-fad7-433a-bd32-70a2a06d8603/17976727554.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144423540/recommendation_letter_for_kindergarten_students_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9274502d-7a09-4537-8867-c0823fcdac25/61594575054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f14081e-c89d-4c2e-80ae-58b0b7aa9a1c/23217312734.pdfIn PDF document text
    • http://fozujedax.pbworks.com/f/8277792187.pdfIn PDF document text
    • http://dujimowiwup.pbworks.com/w/file/fetch/144824631/45419507273.pdfIn PDF document text
    • http://lipovosufuk.pbworks.com/f/34186124595.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/w/file/fetch/144670818/97433275215.pdfIn PDF document text
    • http://zivovot.pbworks.com/w/file/fetch/144657591/how_to_empty_tray_on_foodsaver_v3460.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/f/how_to_write_a_departmental_report.pdfIn PDF document text
    • http://wikoborumun.pbworks.com/f/35351486142.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 4996 bytes
SHA-256: 8c77a8058a160e57496f5da3ebd6ddf416abea78c6630d5a47ce41b962540ffa
font_01_sfnt_off0001195e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 10544 bytes
SHA-256: e28826f2c88bcf9c6cccd9b968851ec3098add09e38dfe2445bbda7b55b8a330
font_02_sfnt_off00013d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7C 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
font_03_sfnt_off000152ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152AB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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