Malicious PDF — malware analysis report

Static analysis result for SHA-256 454dac169aaf0e57…

MALICIOUS

PDF

50.6 KB Created: 2021-02-25 16:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1894dbbb07f3b76c3085b0b2e33e6e3 SHA-1: 5579f94e938cf5a637895f70432f190f445e32ea SHA-256: 454dac169aaf0e576a5027bec9d40adf7175ea4f169504046d29063e8cff6e2c
202 Risk Score

Malware Insights

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

The PDF contains an image-based lure and a critical heuristic firing for a malicious redirector link to 'https://yafferge.ru/aws?utm_term=public+health+psychology+salary'. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9443

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 50 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.
  • 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://yafferge.ru/aws?utm_term=public+health+psychology+salary
    • https://static.s123-cdn-static.com/uploads/4415768/normal_5fde122198acd.pdf
    • https://static.s123-cdn-static.com/uploads/4390637/normal_5fee3da0de2d6.pdf
    • http://pipabineki.22web.org/bixurinenu.pdf
    • https://cdn-cms.f-static.net/uploads/4454807/normal_602e1525df212.pdf
    • http://lajulufubugo.22web.org/vujebefevex.pdf
    • http://ludozikime.22web.org/tadobagipumatonawo.pdf
    • http://gifawel.22web.org/mafabedobenopudatoveme.pdf
    • https://s3.amazonaws.com/lezopobigeza/kurinivizegoziru.pdf
    • https://s3.amazonaws.com/gurowozenupifi/98506965523.pdf
    • http://mapoler.epizy.com/body_systems_diagram_worksheet.pdf
    • http://nidalekunipu.epizy.com/47991790448.pdf
    • http://xerozovurewafok.epizy.com/fantaisie_impromptu_sheet_music.pdf
    • http://natexaz.rf.gd/zalome.pdf
    • https://s3.amazonaws.com/lijopavexanuse/autodesk_fusion_360_size.pdf
    • http://kewivawegimomu.epizy.com/analyzing_primary_sources_worksheet.pdf
    • http://dujenovonufu.epizy.com/16197053719.pdf

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