Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87a85390806d8eb…

MALICIOUS

PDF

94.6 KB Created: 2021-03-10 03:09:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 16a23e86cc1eb1f9b6185261d4692554 SHA-1: c84d338949c72fefce94752e1779606d63768431 SHA-256: c87a85390806d8ebdfef9309bd33ad50d6ddbd1118e572075fcd3702036782f6
136 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with a high-severity heuristic indicating an MFA/one-time-code harvesting lure. The embedded URL `https://mezovuduw.ru/wix?keyword=gta+online+apk+without+verification` strongly suggests a phishing attempt, likely to steal credentials or abuse multi-factor authentication. No scripts were extracted, but the PDF structure and heuristics point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://mezovuduw.ru/wix?keyword=gta+online+apk+without+verification PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484815/normal_6044967c3568b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422879/normal_5fff27b7ed4e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447669/normal_60438b435c9b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448535/normal_600f3dac90b43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502721/normal_5fdcb5a476b81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_5fd0bd1c9a4ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374177/normal_5fdeffe8f3267.pdfIn PDF document text
    • http://appletopshop.ru/what_temperature_do_you_cook_bacon_in_an_electric_skilletoh1sq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401714/normal_5ff35cee861aa.pdfIn PDF document text
    • http://texno3ua.com/cobra_microtalk_121_privacy_codes_rangef6f9t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5fd6351794119.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/palevijuj/lepiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccd0cfeb-c24b-4bda-8a61-63c0238f9ae8/brother_mfc_7360n_toner_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ddf181e-cac4-4cae-8a2f-25e285ff47b5/143_ka_matlab_kya_hota_hai.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/59784124054.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/bhandara_me_nache_binani_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/20008394026.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001277d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277D 5052 bytes
SHA-256: bf5a2deaa338e10186a469d875c4caf3b73698c1d881ea6fd473a5c6d98d47c9
font_01_sfnt_off000138c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C7 11180 bytes
SHA-256: fd0cca4633f1f3b740badec86e1cd981822fa92dfaac7b6861c04f8b341d570b
font_02_sfnt_off00015f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F08 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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