Malicious PDF — malware analysis report

Static analysis result for SHA-256 118b7e1d0a1905dd…

MALICIOUS

PDF

67.1 KB Created: 2020-12-21 04:06:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2c131762bd00ff99be0fbdcef01e3f0c SHA-1: 99498dcd9588f2f0f5dac380bd6138b18ae06c9f SHA-256: 118b7e1d0a1905dd449ba614ca0f593856b23fe1d3c0868127eecaa05628d2fa
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely for a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points towards a social engineering tactic to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/aws?utm_term=book+about+information+technology PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388835/normal_5fc24641b65c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_5fc187b7b5424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c31b66c-8300-43df-b4b4-21b830b59e89/kofiluw.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/dragon_ball_super_saiyan_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1763cea0-d816-42f2-8af0-267e7ba8cc01/23950834513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c3da47-0629-4376-a7b2-9a976d498af8/age_of_consent_for_marriage_in_colorado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d9c6f60-58d1-4f19-9f39-1a2c2716a119/harpur_academic_advising_email.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fec07d6-8445-4ca4-83b5-dbdb63aeb907/kenshi_farming_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2525954d-8f2a-4f09-adf0-c0fea2664b7d/popaguvedopifog.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/bible_for_computer_niv.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_off0000cae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE4 5472 bytes
SHA-256: 11979d79a227358425fd8224d3ef413d6bd65751198d365738a2fc01f4854373
font_01_sfnt_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 10148 bytes
SHA-256: 22675e65b6d109b550749a3f3991b54913ada5779631c96be92feb542a0fae32