Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f981ed28fe846a…

MALICIOUS

PDF

127.3 KB Created: 2021-03-17 01:02:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67a939e01650b588bebadc6af910ff5c SHA-1: 7901fa63137d03d90861b3a087d0c022e240bbb2 SHA-256: a8f981ed28fe846a4339110976015d36ecf5269a8a6d1b1c41615e99b9ac87f7
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a secondary payload or conduct phishing. The document body, though partially corrupted, suggests a lure related to a 'TV guide'. No scripts were extracted, but the presence of external URIs and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/123?utm_term=boomers+vs+usa+melbourne+tv+guide
    • http://dokojusekorukuf.iblogger.org/warezoganorowinebola.pdf
    • https://static.s123-cdn-static.com/uploads/4414167/normal_5fcf44557e4fc.pdf
    • https://static.s123-cdn-static.com/uploads/4428062/normal_5ffed24b7d99e.pdf
    • https://cdn-cms.f-static.net/uploads/4485001/normal_601a1354d8ed8.pdf
    • https://static.s123-cdn-static.com/uploads/4420743/normal_600472878bb0f.pdf
    • https://cdn-cms.f-static.net/uploads/4461780/normal_600a73ca1882c.pdf
    • https://cdn-cms.f-static.net/uploads/4380681/normal_6028933106d64.pdf
    • https://cdn-cms.f-static.net/uploads/4374983/normal_5fdc4b1054602.pdf
    • https://cdn-cms.f-static.net/uploads/4366029/normal_60171c6d5a967.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fowasabitafal.epizy.com/12144918840.pdf
    • http://divasopib.rf.gd/nacionalismo_espaol.pdf
    • http://zejatasiko.epizy.com/56312130714.pdf
    • http://jovuwumadileweb.rf.gd/ritukijaturuxejuvidok.pdf
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_31bf6076123d4b0292ef68376cc6a31c.pdf?index=true
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_6dfafa2e00d447b58fc375caf5f1de79.pdf?index=true
    • http://pinaroz.rf.gd/flat_stanley_books_read_online.pdf
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_ebfd5c8e9f0048c29698487c84d00a69.pdf?index=true
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_a602992aeed0463fabf1364e372f4fff.pdf?index=true
    • http://julisanusifi.rf.gd/proxy_bypass_list_format.pdf
    • http://nedomawof.rf.gd/gapibugekigepoporid.pdf
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_1c29aff852ed4ac3a5724ee5a51288af.pdf?index=true
    • http://sozizowumideni.rf.gd/29053785276.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b2b7.bin
86317fbfd4421b094d6f44aab5711ef2c1e2b8eea76db51c1e0941aa998c8b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2B7 5392 bytes
font_01_sfnt_off0001c4f7.bin
5e621e470db76973c344a33ce4c4d1ecbf9db08e92e0de1e06a917708553fdb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4F7 12468 bytes

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