Malicious PDF — malware analysis report

Static analysis result for SHA-256 755e8e0215258d75…

MALICIOUS

PDF

78.3 KB Created: 2021-03-13 14:30:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d5dba625e998d82af5f603228781e25 SHA-1: 9a341d91edc679da8af2fed8445d2c66a66f291c SHA-256: 755e8e0215258d754b2c41f815bd2cd0312db91385fc3fa9027ffb4fc15c5cd3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'soxebez.ru' and disguised as a grammar practice activity. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection mechanism. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=grammar+practice+activities+pdf
    • http://timecodes.net/2361083126m64nv.pdf
    • http://farvestnn.ru/1412068619f5yfa.pdf
    • http://jevosetixa.iblogger.org/homemade_fishing_bait_for_catfish.pdf
    • http://senenetikoxikom.22web.org/roadmaster_bike_price_in_bangladesh_2018.pdf
    • http://sdfsdfsdf.shaketorch.com/digital_business_card_maker_mod_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fizaxo/40172398448.pdf
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_e77e6fa4cbfa4eee8be185a8f56dfcf8.pdf?index=true
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_1ca57f000c0441b9977fdb2caaa0a00d.pdf?index=true
    • https://s3.amazonaws.com/salosibejodod/winrar_5._71_full_version.pdf
    • https://s3.amazonaws.com/fulazelof/79898442256.pdf
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_ad155b31bba24837ab2605f7658b174d.pdf?index=true
    • https://s3.amazonaws.com/mesotodimus/corriente_pedagogica_definicion.pdf
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_84e2a9992f1541e39690372868312f9b.pdf?index=true
    • https://s3.amazonaws.com/wutezigojuxi/hamilton_beach_coffee_maker_guide.pdf
    • https://s3.amazonaws.com/dikobepibelun/brazed_plate_heat_exchanger.pdf
    • https://s3.amazonaws.com/fevobelijogal/72942659301.pdf
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_682e6f37f1d4455eadc753ac0b6c6a45.pdf?index=true
    • https://s3.amazonaws.com/xukirizugukugi/73898744538.pdf
    • https://s3.amazonaws.com/vavapekadoliti/mla_citation_guide_8th_edition.pdf
    • https://s3.amazonaws.com/jezaxojipevu/65803944616.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_off0000f2e0.bin
40b2ec38c3f6e7339feb386255418a070766c9a19ab8398775106a65ac36ec1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 5360 bytes
font_01_sfnt_off0001050c.bin
37dd9779f9b288c016946cf4c3f4d74b46b2467d8855532924ca5175b8b03117		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 11036 bytes

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