Malicious PDF — malware analysis report

Static analysis result for SHA-256 b310e693f5333f6c…

MALICIOUS

PDF

72.9 KB Created: 2021-02-01 00:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1a375b1be14e464d9c4a62db1d691edc SHA-1: 81feafdb365546f350410a5487304bf1876b3622 SHA-256: b310e693f5333f6c6fdd3db1944565a7bb02d5a41bcfbe045d7a93ea7a8a77f2
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, specifically as a phishing trojan. It contains an embedded external URI pointing to 'https://druttle.ru/123?utm_term=walking+on+the+sun+chords', which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to 'walking on the sun chords'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=walking+on+the+sun+chords PDF link annotation
    • http://importants.space/janusz_woch_kulturystavto53.pdfIn PDF document text
    • http://on-arenas.com/7035158559221lh3.pdfIn PDF document text
    • http://bapipakaroxi.22web.org/mulixatuwar.pdfIn PDF document text
    • http://supportcopyright.net/spelling_numbers_1_to_1000_worksheeteiosu.pdfIn PDF document text
    • http://niwapona.iblogger.org/zunipis.pdfIn PDF document text
    • http://podarokinsta365.site/brunnstrom_stages_of_motor_recovery2nmxt.pdfIn PDF document text
    • http://sidikapefujuxe.22web.org/43128859314.pdfIn PDF document text
    • http://comp-arenda.site/98785663592xc2g6.pdfIn PDF document text
    • http://leketeko.22web.org/miruladuxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mipizaju/25332570970.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/74776121135.pdfIn PDF document text
    • http://jazajebexixe.epizy.com/birthday_greeting_card_design_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/8541819513.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/gojofunub.pdfIn PDF document text
    • http://nalujisutu.epizy.com/choose_the_correct_verb_form_of_money.pdfIn PDF document text
    • http://xukenefurirog.epizy.com/fb_video_extension_firefox.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/posivukerokajobidiv.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 5276 bytes
SHA-256: b79837579c4248b6e46acb4ca618757521280a4b85c207d5395c2b4a2a42d58b
font_01_sfnt_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 11616 bytes
SHA-256: 0dc601612b6d4e3fc55c60b7e3548003d8e3e279a4ef83002f77e9d03b58a3ef

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