Malicious PDF — malware analysis report

Static analysis result for SHA-256 79960245b2cdc7c5…

MALICIOUS

PDF

81.3 KB Created: 2021-04-25 11:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb0f03b61e1f724dd865de1b7c77af2d SHA-1: e1a9b6227011e142e6ebaaf95e5c297660308263 SHA-256: 79960245b2cdc7c54c9f080e78c7e9ebf1a7462b95a710e8f9d72314e49370a9
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, appears to be a lure related to fixing a Roku remote, directing the user to an external URL. This URL likely leads to a phishing or malware distribution site, consistent with a spearphishing attachment attack pattern.

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://jumiwimov.ru/strik?utm_term=how+do+i+fix+my+roku+remote+not+working
    • https://static.s123-cdn-static.com/uploads/4473053/normal_5fc9f098cf8f6.pdf
    • http://vukesis.iblogger.org/42940674267.pdf
    • https://static.s123-cdn-static.com/uploads/4497093/normal_5fccd98eda0c2.pdf
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5fe6c6fed25c6.pdf
    • http://nitapida.mywebcommunity.org/kagugumozalebugakepamubes.pdf
    • http://gegetamuwu.iblogger.org/bedtime_stories_for_girlfriend.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nisiwanolom/exterior_angles_of_triangle_worksheet.pdf
    • http://zezinoretebeper.rf.gd/10778204290.pdf
    • http://kipazafar.atwebpages.com/9359192302.pdf
    • https://s3.amazonaws.com/woxotopapozokev/britax_marathon_clicktight_installation_rear_facing.pdf
    • https://s3.amazonaws.com/xopugup/ace_stream_for_ios.pdf
    • https://s3.amazonaws.com/rizijubovapuk/jemovidivukutavof.pdf
    • https://s3.amazonaws.com/gotenukevepunin/canon_rebel_t5i_charger_target.pdf
    • http://mimarenunev.rf.gd/micro_sd_card_for_garmin_nuvi_2595lm.pdf
    • https://s3.amazonaws.com/gonafoziguwewe/53658918230.pdf
    • http://daxevetefixidaj.epizy.com/metallurgical_flowsheet_development.pdf
    • http://bobozejedisalap.epizy.com/dyson_ball_animal__upright_vacuum_purple_reviews.pdf
    • http://fevasakexelima.epizy.com/71090828052.pdf
    • https://s3.amazonaws.com/vosimalume/how_to_view_comments_on_adobe.pdf
    • http://koxigumom.onlinewebshop.net/handbook_of_austroasiatic_languages.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_off000101c7.bin
81485403d08ded1d6a30ba6ee62f0c072bba0ad147bd912878096e95d74261e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 5092 bytes
font_01_sfnt_off00011325.bin
da48dc8b2b60bb93a879e72cd76fa2a205a39d6dd92e7df18c74a1a0bf3af6b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 10840 bytes

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