Malicious PDF — malware analysis report

Static analysis result for SHA-256 404e316ca9b83acc…

MALICIOUS

PDF

42.1 KB Created: 2021-03-19 05:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e8f9a264c92b852dfb68a811e2aad918 SHA-1: ed864c31ae0c8df15de41bdfc0323748afc04f33 SHA-256: 404e316ca9b83acc6a889fc361b46472198a619a8415cd292e416ff1a1a8888e
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6783

Heuristics 6

  • 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 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 42 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://soxebez.ru/award?keyword=international+journal+of+mathematics+pdf PDF link annotation
    • https://cdn.sqhk.co/rurufimibiwe/hgcib7p/bovavina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_604640d292845.pdfIn PDF document text
    • https://salewuso.weebly.com/uploads/1/3/1/3/131379029/gafirumolesurib.pdfIn PDF document text
    • https://cdn.sqhk.co/rizonozugaj/j17jhjd/nidajokuvivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485450/normal_60354d9c44685.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/IiiKyhf/hit_the_roof_speed_gang.pdfIn PDF document text
    • https://cdn.sqhk.co/vemosoveveb/DqDGhfV/bixovitodibi.pdfIn PDF document text
    • https://vipigenomunopem.weebly.com/uploads/1/3/1/3/131398348/0d66a1a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496607/normal_5fedced27304b.pdfIn PDF document text
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/femebometawif_gamare_pifegaviw_seleded.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/o8gfgcN/rolling_stones_logo.pdfIn PDF document text
    • https://cdn.sqhk.co/juzogimuju/ifhhpmm/miwetaxizepamavojer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383568/normal_5fffc4e875f42.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/gd7K3jd/car_crash_maximum_destruction_mod_apk.pdfIn PDF document text
    • https://posolefuriw.weebly.com/uploads/1/3/4/3/134374222/f638c.pdfIn PDF document text
    • https://bezamefiparafu.weebly.com/uploads/1/3/4/6/134665790/mufokarafe.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_9a5601297fae44848f6739c13d593d0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f450c2a-e086-4aa5-8bf0-f5b0adebb102/tawejuwip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a247e9f7-3ae6-4313-a29b-928c2e0a5b22/lazizogezaseve.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_cd4e24d6ce0b4ec9a0b3a0cdbe8276e6.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_e8467d4fa95b40218a46c48efbf43b0e.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_efd8034a989843f89a1d83cbe6034f32.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_c55bd56f877549eaa33378d7270c1ae9.pdf?index=trueIn PDF document text

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