Malicious PDF — malware analysis report

Static analysis result for SHA-256 be736487fb8ba3e9…

MALICIOUS

PDF

96.1 KB Created: 2021-03-13 16:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea5afb205163bbf7ad6fd8dc4ba2351d SHA-1: ceb335988a0ac1aa100ed85434ef6a1970dadbe6 SHA-256: be736487fb8ba3e9940e0cb31b35bd2145143e7e369a720ea958165ff23eba05
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, which is a common tactic for phishing or directing users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=disturbance+theory+posits+that
    • http://xojanefod.mygamesonline.org/arrancame_la_vida_libro_gratis.pdf
    • http://torixewiser.medianewsonline.com/tsc_maternity_leave_form.pdf
    • https://cdn-cms.f-static.net/uploads/4483072/normal_603d5325ae0f6.pdf
    • https://cdn-cms.f-static.net/uploads/4456686/normal_601548342d4eb.pdf
    • https://cdn-cms.f-static.net/uploads/4418175/normal_602540cb461fa.pdf
    • http://gijofabenetawix.66ghz.com/25670980182.pdf
    • https://static.s123-cdn-static.com/uploads/4443325/normal_60059139d1736.pdf
    • http://tapavinologo.mygamesonline.org/86954173741.pdf
    • http://sivelural.mygamesonline.org/mireno.pdf
    • https://cdn.sqhk.co/fuluzagile/bhaAgdk/65243630504.pdf
    • https://cdn.sqhk.co/fusevatuboxa/hhi9jde/810440765.pdf
    • http://suvolupijiro.mygamesonline.org/pemumiri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_02e49530ee244d1889a78cafe4a1511b.pdf?index=true
    • http://kesolimasakifi.myartsonline.com/10649685237.pdf
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_c236590a07c4467eabf1a3bbb2c88049.pdf?index=true
    • http://moxapowi.myartsonline.com/dogexufo.pdf
    • http://fufolisokoja.rf.gd/41987453880.pdf
    • http://natunizogixot.epizy.com/gijamerasolalotujedezefu.pdf
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_4ca7132256b2474596765656e38753eb.pdf?index=true
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_d46aceccc6f34d099c65c00071df30bc.pdf?index=true
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_e1c7bf21781b4f44a62f9ac77e988534.pdf?index=true
    • 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_off00013a4a.bin
f97aab9e7a07d0248b10edaa0af07fed050b15171c3b1a30d527915268b66bba
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4A 5232 bytes
font_01_sfnt_off00014c1a.bin
c7b9dc5dd95feedbd1efcc1ba053d100b3a2dcd522eeb424411836332600f569
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1A 11432 bytes