Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6ffcba0232330e…

MALICIOUS

PDF

73.2 KB Created: 2021-03-07 20:37:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f56501752882e2f52cd6c4ea23c7dfd7 SHA-1: 7eccb3aaaa538cac56f448177656917126bc63c0 SHA-256: 5b6ffcba0232330ea53cb6ab4ac4c204e4db59dbcc0a9fd5168659306da84f47
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/wix?keyword=worksheet+7.4+inverse+functions+with+work
    • http://clubstore.info/hack_lin_qun_mobile_min_ph_androidilqa5.pdf
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/vubilanet.pdf
    • http://jobipelulimobo.iblogger.org/360196690.pdf
    • https://cdn.sqhk.co/jekunesoru/vjeQB7g/little_boy_haircuts_for_straight_hair.pdf
    • https://jofogeva.weebly.com/uploads/1/3/4/5/134505403/3df51.pdf
    • https://cdn.sqhk.co/wepigosogo/ihM9vij/sandwich_shops_dallas.pdf
    • https://cdn.sqhk.co/bofagenined/Q7hhgg4/sonic_boom_2014.pdf
    • https://soxokelu.weebly.com/uploads/1/3/4/4/134494323/bbfba9400138040.pdf
    • https://cdn.sqhk.co/sevafeluba/ihb9nzz/jumpstart_kindergarten_reading_preview.pdf
    • http://znakomstva69.space/ninja_blender_how_to_turn_onnaelc.pdf
    • https://lirodenagegoket.weebly.com/uploads/1/3/1/4/131437677/lurusulob_fowemuvokubakof_dulezopiso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_99d9b6bdd0394b83a846d0afa7e80b8f.pdf?index=true
    • http://kunaraxanoxun.epizy.com/62398989.pdf
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_cd0b806847674d409d1d3f5f9ba203ec.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde3.bin
eb847ef405ed1c25843eed82a218defcd52bbaf29e2dcc5c7c53a0e4d1dfc4ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 5156 bytes
font_01_sfnt_off0000efa0.bin
da289734def0ca819adb114e2b993b8f3a30be0eac553a8910cd5ad6f1587c21
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 12728 bytes