Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f935a40024142d3…

MALICIOUS

PDF

80.3 KB Created: 2021-03-20 20:09:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be829627d0f06fe5c572a0b3b83b2bec SHA-1: 892777c7858f85b69ab145d38dc5401b5ca4265d SHA-256: 6f935a40024142d32ebb152bf1e332ede0ca4d1832ac7a0cecd12977331c62e1
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'ukulele chords', likely a pretext to encourage clicking the malicious link.

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://xezojetit.ru/strik?utm_term=sixteen+basic+ukulele+chords+pdf
    • https://cdn-cms.f-static.net/uploads/4463808/normal_604b92e944207.pdf
    • http://center-san.ru/wumasoponadudifamyleku.pdf
    • http://vienvozvrat.site/daycare_assistance_ny_income_guidelines7276d.pdf
    • http://1xbets-regs.site/62397242696hrzjq.pdf
    • https://static.s123-cdn-static.com/uploads/4457563/normal_60028ccd4a3ec.pdf
    • https://cdn-cms.f-static.net/uploads/4413585/normal_602ae26b99bee.pdf
    • http://de-bewertung-id2842384.icu/1493710859981rhq.pdf
    • http://premium-cinema.com/12000989154vdg5p.pdf
    • http://medgaj.com/miwojikezit2pwmb.pdf
    • http://getcreditcheck.info/16445158448sa4pi.pdf
    • http://creditscorecard.info/what_channels_are_on_xfinity_latinok4vrs.pdf
    • http://arnautmebel.ru/36223026944llzcr.pdf
    • http://1eyvgo.xyz/nididedoton9bbu.pdf
    • http://linza.media/6978588664582r5v.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wujanozo/besevoxiluzobaw.pdf
    • https://s3.amazonaws.com/tedowafomaru/do_you_have_to_pay_for_disney_college_program.pdf
    • https://s3.amazonaws.com/petuzutemixuvod/best_free_brochure_templates_psd.pdf
    • https://s3.amazonaws.com/pisik/lubigajufijipaminafufija.pdf
    • https://s3.amazonaws.com/fujadabez/foster_care_safety_plan_template.pdf
    • https://s3.amazonaws.com/kavugusepe/gubopiresijinolotes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef03.bin
cf7ef47854d7792a1c1f9078bfef9e2f218831672528d2d971389e237f3d1298
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 5500 bytes
font_01_sfnt_off000101a7.bin
c9fed822655f5e76fcd22bc1b664d89bd4bfa571b4a455bc5a07b2d2579d53d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 10812 bytes
font_02_sfnt_off00012616.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 4324 bytes