Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c51b2e1b6c7392…

MALICIOUS

PDF

38.7 KB Created: 2021-04-04 15:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3699952c994d011d718986820abc1ebd SHA-1: 3169499539a4d0edcbd2231e014714d693e83367 SHA-256: 51c51b2e1b6c7392829e82c373f2b5472547f35adda8be4d96af84761352cbfc
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure due to its image-only nature and embedded external links. The document functions as a link farm, directing users to numerous other PDF files hosted on disposable domains, likely to manipulate search engine results or distribute further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7465

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.
  • 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 38 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://xezojetit.ru/award?keyword=alphabet+phon%25C3%25A9tique+espagnol+pdf PDF link annotation
    • https://cdn.sqhk.co/dosijowikul/haijl9S/32562820583.pdfIn PDF document text
    • https://sixixufur.weebly.com/uploads/1/3/2/3/132303163/basaduzufejileb-vetejuvukip-nufugesadexomuv.pdfIn PDF document text
    • https://tozisodije.weebly.com/uploads/1/3/4/4/134486105/matenumufadexewaripe.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/ejdTIid/slime_simulator_relaxing_and_satisfying_slime_asmr.pdfIn PDF document text
    • https://cdn.sqhk.co/xadelakora/gF0jicj/77171844280.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/igeifgg/legubo.pdfIn PDF document text
    • https://tifobavojosimiz.weebly.com/uploads/1/3/4/5/134505066/13b82d9fd34da.pdfIn PDF document text
    • https://jakigirizog.weebly.com/uploads/1/3/1/4/131453624/muwizeduv.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/iijdibx/derwent_watercolor_pencils_review.pdfIn PDF document text
    • http://steelsho3.club/how_to_stop_bed_alarm13k2i.pdfIn PDF document text
    • https://cdn.sqhk.co/pavupaken/zjbxSqs/jorov.pdfIn PDF document text
    • https://dalideno.weebly.com/uploads/1/3/5/3/135384103/369df6f4380f.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/kolawipabifum-mafadavoneIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/68776258005.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/jekexaxinezopuzeniledemon.pdfIn PDF document text