Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36330982d8c6a7e…

MALICIOUS

PDF

61.8 KB Created: 2021-01-20 18:30:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 367a745d5a6b4ee51d4655b6dd084e5e SHA-1: 092575630b99c3086f386de60fb2b6ec4b42cf0b SHA-256: f36330982d8c6a7e1e506db71826d3da93c196a673a57b579f3fc52727e5f1fc
94 Risk Score

Malware Insights

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

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier, indicating malicious intent. It contains an external URI pointing to 'https://jacksth.ru/123?utm_term=linear+algebra+4th+edition+friedberg', suggesting a phishing or malware distribution lure. The presence of embedded URLs and the overall detection strongly suggest this PDF is used as a spearphishing attachment to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7822

Heuristics 3

  • 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
  • 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=linear+algebra+4th+edition+friedberg
    • https://cdn.sqhk.co/demexadol/Wgjghhi/friday_the_13th_killer_game.pdf
    • https://cdn.sqhk.co/baxorurifina/jhbPkkp/first_viking_attack_on_britain.pdf
    • https://cdn.sqhk.co/fuwifemi/gchgkja/the_finger_family_song_nursery_rhyme_lyrics.pdf
    • https://cdn.sqhk.co/mogizilo/Hgcjbij/momolasefijizipimare.pdf
    • https://cdn.sqhk.co/jowapezo/0HC832H/bdo_prepaid_mobile_reload_unsuccessful_but_deducted.pdf
    • https://static.s123-cdn-static.com/uploads/4481684/normal_6001ffdb50e67.pdf
    • http://runatem.66ghz.com/zukex.pdf
    • https://static.s123-cdn-static.com/uploads/4367668/normal_5fcf4b3131ec5.pdf
    • https://site-1178304.mozfiles.com/files/1178304/73626368723.pdf
    • https://site-1220496.mozfiles.com/files/1220496/23866140403.pdf
    • https://site-1240080.mozfiles.com/files/1240080/dolefaxivipegufavuwe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vovajixavago.epizy.com/caller_id_apk.pdf
    • http://nakepusejedub.epizy.com/25092280744.pdf
    • http://vaxokepa.rf.gd/spelling_connections_grade_3_answer_key.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da1a.bin
fc539517c9400b5db287b9b43f05bf4074cd108730e3593e292c15d6a91bbe40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 5160 bytes

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