Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf061ee0f0950d5…

MALICIOUS

PDF

85.1 KB Created: 2021-04-10 15:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3e7e3bb94ef3b9552e6e4ae47c97348b SHA-1: a53bf8f5293fd67571456d6bf0e9636cd445e1a9 SHA-256: bcf061ee0f0950d521da279fde2a62a940ef2cee9c234109978dc1576cc6be69
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, suggesting the primary goal is to redirect users to malicious sites. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/strik?utm_term=binomial+distribution+pdf+and+cdf PDF link annotation
    • https://cdn.sqhk.co/gowamojon/0kVXif3/71454272987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_604d0cbdc1fac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450876/normal_5ff0d16b18d72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422637/normal_5ff7ba814ab5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5ffea3acce2ab.pdfIn PDF document text
    • http://manaxupupili.iblogger.org/zarutisuduko.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxudopusot/xfbJidD/word_dokument_blocksatz_einstellen.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/Argdgd5/little_ninja_run_an_adventure_survival_series.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_60204c2ec1ccf.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://wasaxotudulolo.epizy.com/algorithms_design_techniques_and_analysis_solution_manual.pdfIn PDF document text
    • http://merilejefug.rf.gd/boolean_search_terms.pdfIn PDF document text
    • http://xuvabome.epizy.com/23776682692.pdfIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_da0e215929cb44efba9034fd602a3722.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24bc1d86-5a1f-4f02-82e7-bbfe96a14c3b/31223014333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83171f7a-24d6-4c03-b16c-1d4b619ba47d/78692159908.pdfIn PDF document text
    • http://roniwixanedif.epizy.com/79591527272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a65ac51-b26f-41c6-978c-0e373f6dc814/information_technology_specialist_jobs.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_07b6c991694a4a369a7ec2071dce2aea.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_2b0bcdde0e4340b5aab9c3b4b4a0d4cf.pdf?index=trueIn PDF document text
    • http://najefitisefema.epizy.com/numuxutajofazuwagik.pdfIn PDF document text
    • http://tufexulirepa.epizy.com/72547747464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd748447-fd55-49fb-a31f-90a8c3d25191/32247088661.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_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 5256 bytes
SHA-256: fe8a4ba0e3764b6521f22f44e7510a4a6ab535c2e1be66bcc3a93d852e7a3e03
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 11480 bytes
SHA-256: a0f49b54f1d102f8f0cb761915f2ae25d273a213bb2f818b646bd195a46667f9
font_02_sfnt_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 16092 bytes
SHA-256: 55d5123ea2e30bb0b6c65147a9271c01f8e2f7536e5e1d4b1c7059638f0fddb0
font_03_sfnt_off0001385d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3