Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56861d482623813…

MALICIOUS

PDF

74.5 KB Created: 2021-04-04 19:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07304a6a3b5deac62f9e587afcc7edad SHA-1: 7d4221b38d69b7e66612513135ca6a1e22bb8922 SHA-256: b56861d482623813b86d110e03eae43e4b7508c769a1530cc91d3e6011b9489e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to potentially malicious sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=btd2+fresh+blood
    • https://cdn.sqhk.co/nubevitawil/ijgeaij/mad_max_fury_road_sequel_news.pdf
    • http://zefujixa.mywebcommunity.org/7284170307.pdf
    • http://gelokan.sportsontheweb.net/concrete_grade_and_mix_ratio_table.pdf
    • https://kobenavu.weebly.com/uploads/1/3/4/7/134714827/f09af44b9a8c5.pdf
    • https://cdn.sqhk.co/bepesewutu/gfMXvXJ/video_editing_app_for_android_without_watermark.pdf
    • http://vuzeliligovitu.iblogger.org/41163440082.pdf
    • https://cdn.sqhk.co/xevowuto/iheZhcm/fiwixizutunumamokaxuvo.pdf
    • http://xadazobisisim.scienceontheweb.net/33781242108.pdf
    • https://fikakexuk.weebly.com/uploads/1/3/0/7/130775276/576b86352f9d1f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fda410ce-f8ce-4cb8-a4bf-6f8d1e6befe0/43614018274.pdf
    • http://mafokesa.onlinewebshop.net/definite_article_in_english.pdf
    • https://uploads.strikinglycdn.com/files/d2461ffc-8016-42dd-b541-ba7d89ed2820/el_arte_de_la_guerra_captulo_12_resumen.pdf
    • http://pekudus.rf.gd/suvibo.pdf
    • https://uploads.strikinglycdn.com/files/12b37a36-cf25-4faa-8f38-00996c15e787/dometic_fantastic_vent_7350_dachhaube.pdf
    • https://uploads.strikinglycdn.com/files/02ba94b4-b37f-4e34-9baf-01bf105b9b27/maytag_dishwasher_troubleshooting_no_power.pdf
    • https://uploads.strikinglycdn.com/files/1e2adf55-e61e-4116-a3bb-380194a98c84/tigozovapi.pdf
    • https://uploads.strikinglycdn.com/files/0247a3ff-6830-4d37-ae4b-bdf4e5a0bb7b/soxovapatex.pdf
    • http://pixagikaw.epizy.com/fodilufuli.pdf
    • https://uploads.strikinglycdn.com/files/ea13630e-cb38-4e7b-8287-a42dfc3f8b31/baxiwupenad.pdf
    • http://zumebixakefeta.epizy.com/nclex_infection_control_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/d5296745-c02b-4b17-b050-aa8e6bf94839/why_my_washing_machine_is_not_working.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e874.bin
3002ec4e5f4206306f26493f01de4dca7fda55c6f01b038f969ccfc2081b05ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 5108 bytes
font_01_sfnt_off0000f9d4.bin
a1ebab12c119ac2cdedbe9bd221d4df7eeca05088049669e1a6f8e657caaa507		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 10300 bytes

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