Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6910e6db510c68…

MALICIOUS

PDF

79.1 KB Created: 2021-03-07 03:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf640e254b54b75fd64a5b15701d57df SHA-1: 20a66e9d207e052c3842245348d89b946ccc8c44 SHA-256: 9f6910e6db510c68734fb02eeed05482cddbe09d9de1390c475f826e6f2c4b0d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many of which are to potentially malicious domains, suggesting a link farm or SEO abuse tactic. One critical heuristic specifically identified a mass external PDF link farm, with the primary URL being https://s3.amazonaws.com/joterige/tapekule.pdf, indicating a probable attempt to distribute or redirect to other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://nipisod.ru/wix?keyword=ts+wine+pics
    • http://help-verifiedbadgecenter.com/castration-_resistant_prostate_cancer_treatment_guidelines8fxyv.pdf
    • http://xsale.trade/anaerobic_conditions_and_acetyl_coa_formationn4w13.pdf
    • https://zaxixeresez.weebly.com/uploads/1/3/1/8/131871416/lapuwo.pdf
    • https://static.s123-cdn-static.com/uploads/4389354/normal_5fdf1ab01a34c.pdf
    • https://static.s123-cdn-static.com/uploads/4448733/normal_5fcea67972bab.pdf
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/5595393.pdf
    • https://cdn-cms.f-static.net/uploads/4418001/normal_6022dbd4642f3.pdf
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/9015863.pdf
    • https://dinorega.weebly.com/uploads/1/3/3/9/133999175/944086.pdf
    • https://static.s123-cdn-static.com/uploads/4476001/normal_5fdee508a8aea.pdf
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/dunebo.pdf
    • http://mesretly.xyz/cancionero_catolico_argentinogizp3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/joterige/tapekule.pdf
    • https://uploads.strikinglycdn.com/files/5ce6014c-5946-4081-b682-acfe6d4a9bf9/3492020136.pdf
    • https://s3.amazonaws.com/takateg/kulukosabemuvoruvej.pdf
    • https://uploads.strikinglycdn.com/files/c25537a3-38b2-4c0b-812b-f2fbba1eb820/divina_commedia_purgatorio_canto_13_parafrasi.pdf
    • https://uploads.strikinglycdn.com/files/5f044521-1bc7-48c9-86ba-b6fe9cd091ac/definition_of_civil_war_in_international_law.pdf
    • https://s3.amazonaws.com/sasufufa/buravaributejedadefegomu.pdf
    • https://uploads.strikinglycdn.com/files/05c0b050-0f59-46af-8f01-a36873a8504a/summary_of_sacrosanctum_concilium.pdf
    • https://s3.amazonaws.com/debiwelof/totofa.pdf
    • https://s3.amazonaws.com/tomamujuf/47927820732.pdf
    • https://s3.amazonaws.com/xepululejiwof/decision_makers_guide_habitual_residence_test.pdf
    • https://s3.amazonaws.com/zuponefi/15314180212.pdf
    • https://s3.amazonaws.com/xupovobejanam/91616447341.pdf
    • https://s3.amazonaws.com/bexolamabad/caboolture_private_hospital_online_admission_form.pdf
    • https://uploads.strikinglycdn.com/files/02f1f918-befa-4d22-83e9-3108a8fc302c/conversational_english_topics.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_off0000fb22.bin
a845ef659fb8d2b275a7ba0f12c147d78142440f2d89b1d93daaaca22414055f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 4632 bytes
font_01_sfnt_off00010b14.bin
c98cad16a84f76f707e3bbc8b9d0edf846ce41dc3c01bf6867ba563b123b3d92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 10412 bytes

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