Malicious PDF — malware analysis report

Static analysis result for SHA-256 37711935f01b7e5d…

MALICIOUS

PDF

118.4 KB Created: 2021-03-19 07:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bb40966f5bdb41997c8e9013c46a3415 SHA-1: 44961d53ed61f775ee619483fdd4e1e2cf1cb5b7 SHA-256: 37711935f01b7e5d1890ea00f74a3fb1b7e36e602245fd03fbc4a1747019918a
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and heuristic analysis indicates it's a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://gimoguvi.ru/award?keyword=resumen+celestina+por+actos+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473062/normal_60414f4b4932f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_6020bd3ed7bb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480173/normal_5fc7e9dfbf8c3.pdfIn PDF document text
    • http://falilufip.iblogger.org/xekiga.pdfIn PDF document text
    • http://vapideloni.22web.org/zapinajijakirijutimeti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5fc6f1afb0039.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424951/normal_5fcd788a47f06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zabevog/jock_culture_bedford_reader.pdfIn PDF document text
    • http://najenovatuxi.rf.gd/78426061082.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_2cdc221e26da4dc6b1ed64612a88d2cc.pdf?index=trueIn PDF document text
    • http://jojixeme.rf.gd/mulodebapunugetunimur.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/73748564945.pdfIn PDF document text
    • http://fikojadepo.rf.gd/62909358005.pdfIn PDF document text
    • http://vejimugar.epizy.com/kuwumijupufutin.pdfIn PDF document text
    • http://kadegezopofog.rf.gd/chalte_chalte_film_all_song.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/bidirectional_glenn_shunt.pdfIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_41d4e04f450841ab8be4d7ecd00298d2.pdf?index=trueIn 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_off000193d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193D4 5308 bytes
SHA-256: 3b640d41d9993599a63ed3ff7dcaf180d04c2a6dc81f9610a27b6eeaf286728e
font_01_sfnt_off0001a5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5CE 11940 bytes
SHA-256: a363e75807a5473cbbfe0b993fe228f5bb5fd6e809ae80057af660fbd6b5e782

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