Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5e47b6d8bf8233…

MALICIOUS

PDF

68.4 KB Created: 2021-05-22 11:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5cbe5a7f14c7e57ad3249fb9c627c1ef SHA-1: 9f7abfe4409e87f5f14f36662efb5ed9412c86c2 SHA-256: 1a5e47b6d8bf8233cf566b1ef816cd174f5a8e4f282d09b583bd96659a89f2aa
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to scholarship results, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8212

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://leonvi.ru/strik?utm_term=jsc+scholarship+result+2018+dhaka+board+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462066/normal_60450a195b08c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_606593659398c.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/lufotil.pdfIn PDF document text
    • https://fotaluxig.weebly.com/uploads/1/3/5/9/135973299/5c7f09eff02e4.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/1568233.pdfIn PDF document text
    • https://rafitiwaxaxeb.weebly.com/uploads/1/3/4/9/134903343/nakoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_60437cd37a508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443799/normal_60661b690b4a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5fd687759316b.pdfIn PDF document text
    • https://fixoxotogixas.weebly.com/uploads/1/3/4/3/134374926/nitedurefukid_fewixezewaxivoj_duririm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418584/normal_60090db062636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_600c0a529c23c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_604d0a36d3f41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f40690de-4f70-4279-8096-dd03dbb19bcf/how_did_spain_colonize_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/18366549422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa24e07-dc6e-4483-8a53-733585005d16/demurapewasin.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/wiziwiwadizuwubukir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16977a3a-c578-450d-813b-4dfcb8c09bf2/toyota_corolla_2009_battery_change.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 6048 bytes
SHA-256: 22f9e2930a266a534cbb0e8a6e4d71155463a2d243b8eeae3ed1e900b8f225bc

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