Malicious PDF — malware analysis report

Static analysis result for SHA-256 c684083f4d8bf326…

MALICIOUS

PDF

70.9 KB Created: 2021-03-01 01:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a8fadb58f000b43b5b248e077e4dbd05 SHA-1: f2716529c65c963ca6dffd5dab70696d328eee34 SHA-256: c684083f4d8bf3266e620404b8d5e9ada047e73c3b7534502058d0757d9654cb
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7842

Heuristics 5

  • 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
  • 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://fokemale.ru/award?keyword=spirit+blossom+yasuo+animated+wallpaper PDF link annotation
    • http://xegafutulon.iblogger.org/supervisor_job_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/RggjfRS/workday_login_digikey.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/Qgdggdq/xinigela.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/fuginudevefelum.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/a52cf.pdfIn PDF document text
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/1af71.pdfIn PDF document text
    • https://jesugenug.weebly.com/uploads/1/3/1/4/131406432/jomum.pdfIn PDF document text
    • https://cdn.sqhk.co/wavivatus/fhjjcgg/67414893028.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/bz21giW/97206203841.pdfIn PDF document text
    • http://playmarket-online.com/leminajasen2gecy.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/hcjidCE/tesco_online_shopping_groceries_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mexijegedakol/use_onedrive_to_backup_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/big_data_tutorial_point.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/41330502217.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/vikuwixalumafekapo.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 5424 bytes
SHA-256: 9f9de23601191f08d35d9df91d73f55359691cf0c6f2e165d415ccaa1c8bc0a0
font_01_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 10112 bytes
SHA-256: 6eda31fd4b6dc2ab84161b1bcd5cf8362e0867813a41ab6636bbf5c5ba7ddfd9
font_02_sfnt_off00011129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11129 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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