Malicious PDF — malware analysis report

Static analysis result for SHA-256 924d5ace8cd97820…

MALICIOUS

PDF

78.5 KB Created: 2021-04-06 04:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32ab026a7a6e9fb8d63e525272bc3d37 SHA-1: a16433d3fd7d60655bbc705f642eea9cb0128008 SHA-256: 924d5ace8cd97820711af2b7f37db7fd475150ab69733864c2add553ce26c122
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. The presence of a large number of external links, including a link farm, suggests an attempt to direct users to potentially harmful websites for phishing or to download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/wix?keyword=recycle+triangle+6+ps
    • https://bikekifo.weebly.com/uploads/1/3/5/3/135304891/0458d603.pdf
    • https://cdn.sqhk.co/nisikevepoxi/a6Lijhd/lagoranove.pdf
    • http://pifumufupes.iblogger.org/books_on_body_language_and_facial_expressions.pdf
    • https://cdn.sqhk.co/naziwixolagu/wQVgcii/rizodetetupusewodemegowo.pdf
    • http://naderuromopuru.22web.org/76692244499.pdf
    • http://speak4pro.com/44423672926mq4h2.pdf
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/jiluger_jeneg_gosevoxupi.pdf
    • https://cdn.sqhk.co/mojafefegamo/cghcgib/jikupaxovivefifijapusosa.pdf
    • http://dazemuwemez.22web.org/roranefimawavegosel.pdf
    • http://bupetud.xyz/9228192914m0lay.pdf
    • http://ezfix.asia/japan_hoi4_strategyky1ue.pdf
    • https://jebadufe.weebly.com/uploads/1/3/3/9/133997269/pudag.pdf
    • http://tepaxaluwu.22web.org/sigejibe.pdf
    • https://wijuluberaselak.weebly.com/uploads/1/3/4/0/134016921/nefuzipifomedufep.pdf
    • http://topplafond.xyz/29691275202949jj.pdf
    • https://cdn.sqhk.co/rekubapapup/LP0Ntja/47220661334.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://newumil.epizy.com/cloud_computing_jobs_salary_in_kolkata.pdf
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_7a42414c73b04a29a6cb409e8d387b2a.pdf?index=true
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_06c54a622a904e1cb409165e9521457e.pdf?index=true
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_1deb95ead10b4471adab64b6c9088442.pdf?index=true
    • https://a01f0313-f680-4530-87a9-ce77a10bb621.filesusr.com/ugd/ac0554_42b8c3d5e37947e5ae5ba49056434b47.pdf?index=true
    • http://xirewubekato.epizy.com/historicidad_y_temporalidad_de_los_conceptos_sociologicos.pdf
    • http://takugiwem.rf.gd/dazevomot.pdf
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_4cae286816de4bbeb5b9da63aa83c877.pdf?index=true
    • http://nokarox.rf.gd/tappan_cooktop_range.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_off0000f588.bin
f624531a8c4fde9422a8684289938b555c9ced2d2c18a2a2e01f7a5bff44a4fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 5364 bytes
font_01_sfnt_off000107e5.bin
09f9ee849baaaf8072954e9acc2c3667738d9c654577332bd4e15bc312341791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 10680 bytes

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