Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ce467ed3c46985…

MALICIOUS

PDF

85.9 KB Created: 2021-03-20 13:31:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4226596deff6ecb435c1e6e4c5d27040 SHA-1: 2f1c44c8b8df9636ea1a2b9bae570d4757855b1c SHA-256: 81ce467ed3c46985156f99f5e610879aab08d1eef300ee98b2971a23abd0af9b
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing lure. The document body, though heavily obfuscated, appears to reference product information, suggesting a pretext for directing the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/strik?utm_term=bosch+silence+plus+44+dba+does+not+dry
    • http://jatuligirez.22web.org/22925374056.pdf
    • https://cdn-cms.f-static.net/uploads/4421333/normal_60345dca740bf.pdf
    • https://cdn-cms.f-static.net/uploads/4443356/normal_603e5dad1dd17.pdf
    • http://nitofotinelip.iblogger.org/8109717552.pdf
    • https://cdn-cms.f-static.net/uploads/4418762/normal_6022c72002c24.pdf
    • https://cdn-cms.f-static.net/uploads/4419452/normal_60377fe170a31.pdf
    • http://juwolopuga.66ghz.com/bootstrap_4_documentation.pdf
    • https://cdn-cms.f-static.net/uploads/4412887/normal_604e598881e52.pdf
    • http://jaraxusej.iblogger.org/65268069773.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_2a40662268304d5e980982a87a64d6ea.pdf?index=true
    • http://merixokove.rf.gd/93529747001.pdf
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_24bf0eed77d54acbb858a1c867ec4aea.pdf?index=true
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_f04ea094d2954092aecfdedb685d18b6.pdf?index=true
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_ec61218a7b4e42579c1400c1aa31897d.pdf?index=true
    • http://zarilapaserit.rf.gd/bivvies_with_built_in_groundsheet.pdf
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_3231c787cff54e0d80d5421825e5dfb5.pdf?index=true
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_39e49917e087497891a29558a21e89dc.pdf?index=true
    • http://rubuvajaroxe.epizy.com/luwoge.pdf
    • http://lajoxugulip.epizy.com/how_to_get_more_furniture_recipes_animal_crossing.pdf
    • http://babematalal.epizy.com/radiological_anatomy_of_abdomen.pdf
    • http://dolizanawuw.epizy.com/89897092206.pdf
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_66c2f3451b3647abb9b1822f069497a2.pdf?index=true
    • http://basapixukeg.rf.gd/pazalusewekovuwawe.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_off00011096.bin
b3944ef75968d3352b187e4449013dade518e8d1d90046a9f2e24cecccffed41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 5540 bytes
font_01_sfnt_off0001236e.bin
088a20648f8f544e0279d92e4f57533ceaa2a8797d25219b1f3d2fddfe7ea409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1236E 11192 bytes

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