Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7458cb23b95b485…

MALICIOUS

PDF

70.7 KB Created: 2021-01-16 02:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 945c09fc9aeb146ebd185775ab2692fc SHA-1: 4c067d00f18b0834aeacc2a549a513408a411624 SHA-256: a7458cb23b95b4858b7914023d38b479e0297c381236fd92b58d69f869021b82
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL, identified as a high-risk indicator. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to 'Counting atoms and elements worksheet answers', directing users to a suspicious URL for further action, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/123?utm_term=counting+atoms+and+elements+worksheet+answers PDF link annotation
    • https://site-1213735.mozfiles.com/files/1213735/48746749336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_5f9e25d3e776f.pdfIn PDF document text
    • https://site-1233197.mozfiles.com/files/1233197/fibojanapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_5fd94a2eefced.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/jcRhD7H/maxisys_ms906bt_reviews.pdfIn PDF document text
    • https://site-1166067.mozfiles.com/files/1166067/32466035214.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/gfg2hid/jovefozata.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/zerepuzuze/marysville_lions_club_marysville_pa.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/lightning_bolt_sound_effect.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/analysis_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/eagles_game_live_streaming.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/aviso_previo_proporcional_reforma_trabalhista.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_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 5300 bytes
SHA-256: c82c51c9ea5b52c28d496a1c482df0d3b2a3cb3b09d1fbfc175b88d20518296d
font_01_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 9848 bytes
SHA-256: 19da660c1e20c13152c14c1158e10936ff9bd3b9679ea9a72a1b792e90e8bd9a