Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e90999b97c43ca2…

MALICIOUS

PDF

78.1 KB Created: 2021-03-30 03:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f676ff62fd6882170548547833601e1a SHA-1: b64f68c7f2eb03f54adb6a704bae5d86eccdef23 SHA-256: 7e90999b97c43ca2385ac340f5f13ebb659b715e1e7a0a16af4f448349f0562c
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with one URL pointing to a potential second-stage payload. The ClamAV detection and ML classifier strongly indicate malicious intent. The document's structure and numerous links suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=p90x+mass+schedule+pdf
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/vefinu.pdf
    • https://pobejatu.weebly.com/uploads/1/3/2/7/132741278/d6ac0c.pdf
    • https://mafaredoli.weebly.com/uploads/1/3/2/6/132695491/442848.pdf
    • https://mebedepubini.weebly.com/uploads/1/3/0/8/130813558/319043ffd19e9.pdf
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/givataw.pdf
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/08c6d34b4d09cdd.pdf
    • https://vaxetilunakado.weebly.com/uploads/1/3/4/0/134012354/xutesi_lexewowaba_bimope_numutur.pdf
    • https://bejizasidofivi.weebly.com/uploads/1/3/4/2/134234705/lopituwexetanumug.pdf
    • https://misefumod.weebly.com/uploads/1/3/2/6/132680918/sekunetefofibe.pdf
    • https://wutuzorul.weebly.com/uploads/1/3/5/9/135963099/nejutakemotisovov.pdf
    • https://kafowuvipuv.weebly.com/uploads/1/3/4/3/134337110/lamulazek.pdf
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/zakixomiregegez.pdf
    • https://gibuzilo.weebly.com/uploads/1/3/4/6/134602166/zarakoz-kibinij.pdf
    • http://dafagaketa.sportsontheweb.net/axiomas_de_zurique_livro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sudexixurijaxoz.atwebpages.com/85231033560.pdf
    • http://popofisofol.myartsonline.com/vatizakomulimidojogumu.pdf
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_e84288eeceff4008861067952c2cd6c5.pdf?index=true
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_4b0f6cc0396c4ce881b566a4f0a36ea5.pdf?index=true
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_9d38a94e8e9649e9aef6d1712fe9c960.pdf?index=true
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_cf5808bc776142ecb5ca35b98524d5cd.pdf?index=true
    • 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_off0000f191.bin
ac0d6d81dcaf36f68459070f2c7be8556c8e40164685628c9fc47b2c948bad06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 5668 bytes
font_01_sfnt_off000104bd.bin
06e5f1c54e43b9be12b1028a5d0d5e96f494f7b9c22b35fdea438b070b14a5e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 10820 bytes

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