Malicious PDF — malware analysis report

Static analysis result for SHA-256 a040d18920d131bd…

MALICIOUS

PDF

74.0 KB Created: 2021-01-17 09:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1e80a084c204d3ceb36c59209b634787 SHA-1: ce443d398f5cfef1284cca9c1591341848d0ccf2 SHA-256: a040d18920d131bdb18da6dc4c78b0e21e41a0ea829b633b85bc574a145f2e1b
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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 URI pointing to 'trafffe.ru', which is likely a malicious domain used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a harmful site.

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://trafffe.ru/123?utm_term=500+gallon+tank+smoker PDF link annotation
    • https://site-1205776.mozfiles.com/files/1205776/dolusagekevusaguw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5fa71567dbd1c.pdfIn PDF document text
    • https://cdn.sqhk.co/koxajavu/jaz5Thh/nubugujovijovofon.pdfIn PDF document text
    • https://site-1173403.mozfiles.com/files/1173403/download_hero_jump_mod_apk_latest_version.pdfIn PDF document text
    • https://site-1220248.mozfiles.com/files/1220248/alter_ego_names_male.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/tiigfMU/residual_value_formula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470964/normal_5fe791fb38b77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443356/normal_5ff3e437d25b4.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/zumezeviwakiz/5485555913.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/hadith_bukhari_free.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_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 5240 bytes
SHA-256: 5cafefdd4979afe3e88d563fbf8a9c68e3b755695efd0f39a3f05b0786ffc747
font_01_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 10672 bytes
SHA-256: 23f65d4956d0434c9ac3afc2e58ae981a1eb8e4cc89fb69b44d02929e09ec414

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