Malicious PDF — malware analysis report

Static analysis result for SHA-256 add39fd9b8c8b36b…

MALICIOUS

PDF

74.9 KB Created: 2021-04-02 19:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9501c3e9521cabdb70eede4f89826b0e SHA-1: 50ccad8c844fec4e578aff4715c535be48ce2f04 SHA-256: add39fd9b8c8b36b3a795eb99520a704edd0550e1441a86c3164b3a29ec1cefc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with one prominent link pointing to a URL that mimics a search result. This suggests a phishing or SEO poisoning attack, aiming to redirect users to malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-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://resalured.ru/wix?keyword=andrew+jackson+reading+worksheet+answers
    • http://mozejuvedum.22web.org/aiag_spc_manual_3rd_edition_free_download.pdf
    • https://cdn.sqhk.co/josipinu/DrT7idn/dining_chairs_set_of_4_white.pdf
    • https://gavemipaxok.weebly.com/uploads/1/3/2/6/132680822/6df31ffc7f727a.pdf
    • https://cdn.sqhk.co/durotula/idifhju/sound_effects_app_free.pdf
    • https://muwikilakejo.weebly.com/uploads/1/3/4/5/134519857/zemadimexotelir_rulaj.pdf
    • https://ranutejojem.weebly.com/uploads/1/3/5/3/135314135/2828773.pdf
    • https://cdn.sqhk.co/miloxuso/tigCCrk/shadow_skateboard_apk.pdf
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/migesewibajajaja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_65dc7f2d41d0477e88e422070ee208df.pdf?index=true
    • http://najaxobefirag.epizy.com/pimojaganawoso.pdf
    • https://s3.amazonaws.com/bokofapig/andreas_moritz_kidney_tea.pdf
    • https://s3.amazonaws.com/sazixipame/65586224325.pdf
    • https://s3.amazonaws.com/vukujidor/vipijafadimofitipakolad.pdf
    • https://s3.amazonaws.com/wuzalugiseto/57675988876.pdf
    • https://s3.amazonaws.com/kafises/gelatine_sheets_woolworths.pdf
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_174bfadf2920472480921f9d6ab1b3da.pdf?index=true
    • https://s3.amazonaws.com/zumezeviwakiz/how_to_tell_when_my_mossberg_500_was_made.pdf
    • https://s3.amazonaws.com/vapite/tajutusemevu.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_off0000e5a4.bin
095152eb2918ea168ab642a01267864ef125f42524d520011a41cd924e8a3287
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 5392 bytes
font_01_sfnt_off0000f80c.bin
b99b086db8a8c2c7e8eac3d18fa265f52beaec28b0c7d95659745a53e4a5f564
pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 11152 bytes