Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c598536584c125…

MALICIOUS

PDF

61.7 KB Created: 2020-12-26 00:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a5d0175ea357f69e39d07cf9f4cbab7b SHA-1: 59b7faffb3ae7ceb4a423cf6933f363dfb920466 SHA-256: 87c598536584c125848e3673641ae7d73afeda485b9f35bb15cfebdf38d33bee
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://cctraff.ru/strik?utm_term=mandala+coloring+book+pages', are designed to lead users to potentially harmful websites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/strik?utm_term=mandala+coloring+book+pages In PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/efaa75c5d5.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/17a54a1e.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/4310928.pdfIn PDF document text
    • https://figejarorosuwe.weebly.com/uploads/1/3/4/4/134433037/lonitovewa_folewisux_bunukilozozef.pdfIn PDF document text
    • https://nesiritu.weebly.com/uploads/1/3/4/6/134612540/9c7c81.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/suraze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/widofokevibogevulutisis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5214c2d8-7399-4eea-9cc7-d772cf9ee900/86046674252.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/limejisawovabejeviwaluvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b48cd2c4-4b64-42e7-8b81-a386c34cdb1d/22787067262.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/iannoni_s_deli_new_castle.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/damijigojukutezis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C0 5452 bytes
SHA-256: 64bc2aef2b613b087cf8402d8fbea032a7b1171dbb2378843810bd3e358b2ac2
font_01_sfnt_off0000cb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5B 9116 bytes
SHA-256: 1c179801d59727c99c5eaa7a4faaeeb09f3cfe82578d9506d1cb074e7a541d48

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