Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93b0ad2b1c6bc6d…

MALICIOUS

PDF

78.0 KB Created: 2021-02-26 06:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b4f56f3fe62a6a8c79a52254b7106ef SHA-1: da0aecfb76cb18f79c674691b41736a5f331a997 SHA-256: e93b0ad2b1c6bc6d8339056656e6b3484a51ddc04c1699c702b75305121ed57f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least two identified as pointing to known malicious redirectors or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=cyberpunk+what+kind+of+game In PDF document text
    • http://pasikufopubiwo.mypressonline.com/what_does_95_percent_confidence_interval_mean.pdfIn PDF document text
    • http://munupesifak.22web.org/47459202437.pdfIn PDF document text
    • http://citruss.space/sogidajujen65.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/dokiliwuxolademujeju.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/5671129610.pdfIn PDF document text
    • http://whitecheat.xyz/mailbird_pro_crack2k0bn.pdfIn PDF document text
    • http://vofufime.mypressonline.com/nimuxegajet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://perexuwofogefo.onlinewebshop.net/duwelijutumozuganekiperab.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/wolf_gourmet_countertop_oven_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/venokuvemeruvuni.pdfIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/93925406567.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/kaforatafo.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/bodyweight_workout_for_back_and_biceps.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 5548 bytes
SHA-256: 48b57fcadc0c7a91c1d3ee3080ae19aa9a3d89e292097f94a3aab6f6e82a6235
font_01_sfnt_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 11492 bytes
SHA-256: e4314620fcf4641df9be1edab9c985dd0dcd680f54441d54f2b70067b914e4a0
font_02_sfnt_off00011c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f