Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c961d8ebf4394d8…

MALICIOUS

PDF

75.9 KB Created: 2021-04-02 10:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bc0838722162eb0ecf876e15a23a44b SHA-1: 2ef8a1f2f2ccd241bd20d4063dfe712f05733e88 SHA-256: 9c961d8ebf4394d87cbe81c8c57a827d248c2c351a4f03aa23da6d024eaa4f13
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, some hosted on disposable domains. This technique is often used for SEO manipulation or to distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=carquest+battery+charger+cq-30cr+manual
    • https://bekitatabegoze.weebly.com/uploads/1/3/0/7/130775701/xizifaz.pdf
    • http://kavelokafozi.medianewsonline.com/physical_access_control_policy.pdf
    • https://cdn.sqhk.co/putizimetiwe/ibifjdk/hustle_castle_facebook_error.pdf
    • https://cdn.sqhk.co/tavaxiwugo/8Wic8VM/78280010753.pdf
    • http://nozumupi.medianewsonline.com/viwifusinumab.pdf
    • https://sanajupa.weebly.com/uploads/1/3/1/4/131406847/bugapigab.pdf
    • https://cdn.sqhk.co/pazaxefuma/hj0XF8X/high_waisted_jeans_button_front.pdf
    • https://zizuvikugit.weebly.com/uploads/1/3/1/3/131384696/6033762.pdf
    • http://vazawujuzu.sportsontheweb.net/fubenekozisiw.pdf
    • https://cdn.sqhk.co/busosuwik/oihgjjc/weed_leaf_outline_tattoo.pdf
    • http://xadexawufomovi.sportsontheweb.net/bulats_test_sample.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_6e04765e0a52423991ecabdbb9a1bf79.pdf?index=true
    • https://s3.amazonaws.com/webipejonavuv/vista_128_delete_master_code.pdf
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_7e39cddb63f04818b9e8c578003a4bfd.pdf?index=true
    • https://s3.amazonaws.com/mefovu/minority_report_tv_series_filming_location.pdf
    • http://lenofafezanobu.atwebpages.com/victoria_symptom_validity_test.pdf
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_c81bf939da4e4f6badf64dfe790ccb29.pdf?index=true
    • https://s3.amazonaws.com/zarevizebi/champion_film_video_song.pdf
    • http://kafotafuvodalix.onlinewebshop.net/antiviral_drugs_medicinal_chemistry.pdf
    • https://s3.amazonaws.com/bidemewufa/ravojagazutedevob.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_off0000e929.bin
b1625eb4b922fefb613671e83c78dcef2770c0a18d4f12b3af7d67bc54c7e01a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 5824 bytes
font_01_sfnt_off0000fcdc.bin
fedf11a11e792df601a94a540a33f130463522cfeaad87ffcfc9514f3f03c0f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 11012 bytes

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