Malicious PDF — malware analysis report

Static analysis result for SHA-256 42848e1a77e0c9e2…

MALICIOUS

PDF

71.7 KB Created: 2021-02-17 03:10:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de0e5b47a345d6439f72bf958d5ef484 SHA-1: bebf21dabb604a323903ea3fa23461ca83bdb02d SHA-256: 42848e1a77e0c9e2173747983537a818e935d596e49dd78e47e2e11dcc120201
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 disguised as legitimate documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed for user-driven compromise.

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://bologen.ru/wix?keyword=certificate+of+completion+high+school+michigan
    • http://help-verifiedbadgecenter.com/how_to_make_yourself_miserable_dan_greenburg_downloaddnx7c.pdf
    • https://baraxuworasexe.weebly.com/uploads/1/3/4/6/134633060/064a6.pdf
    • https://wasavegod.weebly.com/uploads/1/3/4/5/134589575/4684772.pdf
    • http://teenagetutor.net/123894400991j4rv.pdf
    • http://makedctl.site/orthographic_projection_solved_examples8dx5n.pdf
    • http://setofexperience.site/rolinavafarezrzj4.pdf
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/3949052.pdf
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/lijamezud.pdf
    • http://ontrade.top/find_my_phone_app_free_download_for_pcf3vis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/silubebebefuju/blacksmithing_guide_wow_vanilla.pdf
    • https://s3.amazonaws.com/rozebofukixus/clash_of_lights_s2_apk.pdf
    • https://s3.amazonaws.com/libeganot/61674431312.pdf
    • https://s3.amazonaws.com/xakapudakadu/zajedo.pdf
    • https://s3.amazonaws.com/dibedamoka/two_wheeler_sale_agreement_format_in_english.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd7.bin
35480f35acbf69925844f2646a0c5dafefeaf43aaf3a6efd72e8c62505dfe9a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 5332 bytes
font_01_sfnt_off0000edca.bin
4a4261b42d2b0cbd3eeb0bb991438187a4d46b01833184a6c7cdee718f248fa0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 10596 bytes