Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6e73e33542ca41…

MALICIOUS

PDF

75.7 KB Created: 2021-03-29 04:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 799cc76f46584aff7b445ae0f678ba04 SHA-1: 3ed597e9fa77ad9117aa9818d8a31eed83b00a1d SHA-256: cf6e73e33542ca413c1312f348ef21e50036ef61cf7aa04f9ca4c965cab53d9d
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 ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs pointing to other PDF documents, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of multiple disposable hosting domains and a high number of links indicates a coordinated effort for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://kuzutuzo.ru/award?keyword=dark+psychology+101+pdf+download PDF link annotation
    • https://cdn.sqhk.co/rigizisojix/R85haW0/46067228873.pdfIn PDF document text
    • https://fajesafopumusid.weebly.com/uploads/1/3/1/8/131871419/2df190.pdfIn PDF document text
    • https://pananufizusa.weebly.com/uploads/1/3/4/4/134445813/duwokogukax.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/ZkcidMd/board_game_subscription_box_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/vibesadebo/bjebieP/mojobazunusile.pdfIn PDF document text
    • https://xudomulur.weebly.com/uploads/1/3/4/0/134040538/nixedov-duzugam-jerut.pdfIn PDF document text
    • http://kemobot.22web.org/anfotericina_b_mecanismo_de_accion.pdfIn PDF document text
    • https://dalatomim.weebly.com/uploads/1/3/4/3/134344090/mibabunutil.pdfIn PDF document text
    • http://rufawefojag.sportsontheweb.net/16107254642.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/fbx8jBc/mulafitisejebobipe.pdfIn PDF document text
    • https://cdn.sqhk.co/xagogudexo/gEWhbhh/4358894437.pdfIn PDF document text
    • https://xexiwimelogodit.weebly.com/uploads/1/3/4/5/134593193/dotizike_vadoka.pdfIn PDF document text
    • https://gavojaxuwutik.weebly.com/uploads/1/3/4/3/134319320/nikelaxibuvol-digizudafo-rejizigivakoxoz-xelusawikupu.pdfIn PDF document text
    • http://mobutadaxez.medianewsonline.com/bergey_s_manual_of_systematic_bacteriology_volume_3_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/ljh0ijC/weather_satellite_map_ireland.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/Gtiehgi/mr_bean_sandwich_stack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/hbohbhi/divuje.pdfIn PDF document text
    • https://jipafopabos.weebly.com/uploads/1/3/3/9/133986828/bosapuroju.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/jclAhbZ/gem_hunters_tv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuguzametekobo.myartsonline.com/gajenulizol.pdfIn PDF document text
    • http://wegoxoxajenugol.rf.gd/tapon.pdfIn PDF document text
    • http://difeligaken.epizy.com/lenovo_t430s_wlan_driver.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 5868 bytes
SHA-256: f6bf351ab30585eebaaa133de67c34042c4c7d185591975e0464854de6d6acd5
font_01_sfnt_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 10620 bytes
SHA-256: 645a60aac1f902e1dfefed121678ece5af4869af32c513508167bf469c10be35