Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e5ef0c131bf0b4…

MALICIOUS

PDF

138.1 KB Created: 2021-04-09 07:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ed73b430bb77b3fb09efdf8f198fbfe0 SHA-1: edde123cbcc8af5786c65f8ff431908ab4e8c2c4 SHA-256: f0e5ef0c131bf0b41a7d7678c964defba79f55f45b3f7214042422919c04daa6
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://bologen.ru/strik?utm_term=resumo+historia+concisa+do+brasil+boris+fausto', is likely part of this scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bologen.ru/strik?utm_term=resumo+historia+concisa+do+brasil+boris+fausto PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423752/normal_6025448dd8ffd.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/ghjg5gd/great_battles_medieval_xbox_360_achievements.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5fdd8ced74dbd.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/jeghghj/tap_titans_2_best_artifacts_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387427/normal_603974865e34f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374520/normal_5ffb348e43bf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410962/normal_5fc9238046fa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474470/normal_6023a4131c7f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483336/normal_605ff7762589f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_60130b5e17209.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvazilu/bYghqvP/40713364957.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/74bc0d51-3bc3-489e-9d5c-62a3e2299ad9/dehumidifier_not_collecting_water_uk.pdfIn PDF document text
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_7c1ee258257d45ac9b13fb031fc9ebe0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c4ec4c-4c54-429c-a005-c20327cd4d55/devedexopetifovutefas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98ba1a6-f0a7-4307-b006-338ec702f5f2/how_do_you_use_a_hamilton_beach_roaster.pdfIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_7cdfdab4ee4046ea9200aa279b798968.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9b96c3-fe24-4c7a-86dd-d0e0ed1d589f/what_is_management_style_and_leadership.pdfIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_e66c8e93404c4235b04ca14d96bf6035.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cedc5137-65c2-404e-90be-8d7052bee863/85854043394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef601d63-ebf1-44ba-94ca-966be9ff3611/percy_jackson_and_the_lightning_thief_cast_marie_avgeropoulos.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_88b5dc4516944d989d2992a3f20c76dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd959e9-40bf-4a15-abab-c79d27d79fb3/61323589625.pdfIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_449abdf50e4c40c38bd1b46ae6f048ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba2e34a-687b-4e5e-a2ac-be2d9e88de6b/27483465097.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_off0001db86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB86 5408 bytes
SHA-256: cf756147127e10a7daa7f0fd261f8591eb3380dc6e04284e76aaa2ccaf2d79bd
font_01_sfnt_off0001edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDBA 14780 bytes
SHA-256: 302d3769edfcb99d1ed3054928dfb090e11d6d63544bfbf019a0a9a6b124fc79