Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1da5a56e6357e06…

MALICIOUS

PDF

71.4 KB Created: 2021-02-16 17:01:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 684c63f8327fc532052a2a54ededa46b SHA-1: d7500a46ea7009b3d14acc555af097d33e68d89c SHA-256: f1da5a56e6357e0679cfe5c4a6761355da083679521ea6939e362bec666f798f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=nike+air+force+1+low+white+mens+8.5 PDF link annotation
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/funolobuguvin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_6024627166d58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403684/normal_601585c4a284f.pdfIn PDF document text
    • https://nunevebola.weebly.com/uploads/1/3/4/8/134846747/kavib.pdfIn PDF document text
    • https://nidukonijeso.weebly.com/uploads/1/3/1/3/131381088/rinajifiw-wuzimovogi.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/gometerokutadob.pdfIn PDF document text
    • http://doordash.fun/faceapp_pro_apk_cracked_onhaxpijxd.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/634160.pdfIn PDF document text
    • https://guvoladedesu.weebly.com/uploads/1/3/1/4/131453897/jevesakebi.pdfIn PDF document text
    • https://rumirasikimuzib.weebly.com/uploads/1/3/2/7/132710795/zegul.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/lomobomiwadeso_labibexaxunabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_600a740151def.pdfIn PDF document text
    • http://detonicufficiale.website/fetedobuse4ynoq.pdfIn PDF document text
    • https://cdn.sqhk.co/xakutofi/hPNiiib/zelle_wells_fargo_500_limit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452607/normal_60092a7a7940a.pdfIn PDF document text
    • https://zoludapi.weebly.com/uploads/1/3/4/5/134528767/kosowututupoxal_kinusewudez_sibun.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/zupow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 5648 bytes
SHA-256: 5a308e24b175e9f1d16af9991c45b3ed57b01169855ed9795eadf7b50b52bd07
font_01_sfnt_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 10560 bytes
SHA-256: 919e112389e9a79738f287a0a70157e1077d2b88fd2b609781ea662204d24d6c

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