Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06a8188b4793655…

MALICIOUS

PDF

86.9 KB Created: 2021-02-05 03:17:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 63e05a10e87cd2488825e6f711221075 SHA-1: 26f88d7f394ad04b8ac1ada94951f3e704caf3b3 SHA-256: f06a8188b479365563e048b9f874262da6ec39a65adee576f4347a951ab575d9
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically pointing to 'https://yafferge.ru/123?utm_term=popular+backpack+brands+90s'. The ML classifier and ClamAV detection strongly indicate malicious intent. The document appears to be a link farm designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://yafferge.ru/123?utm_term=popular+backpack+brands+90s In PDF document text
    • http://roflan.site/69744719985jwwbz.pdfIn PDF document text
    • http://basiditdcf.space/84063522104rcmhj.pdfIn PDF document text
    • http://shtangye.xyz/juliet_takes_a_breatha7zrk.pdfIn PDF document text
    • http://letnesil.xyz/flip_dunk_gameplayzxkcs.pdfIn PDF document text
    • https://mixuzurul.weebly.com/uploads/1/3/2/3/132303374/mosuzizojeno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463529/normal_5ffbc2379a557.pdfIn PDF document text
    • http://orbitan.fun/490546214717yqwo.pdfIn PDF document text
    • https://muvanuxeb.weebly.com/uploads/1/3/4/0/134096654/manesunamude_finema.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500679/normal_5fc8888b1bc42.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/zakunafu/hypertension_treatment_guidelines_during_pregnancy.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 5568 bytes
SHA-256: 73a6b7486ad09291f973665c572b321908dfd5c88f5de7327f6b6a1c30eaad91
font_01_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 2044 bytes
SHA-256: 9812099c5b295b859b411b79c63ef0f3e15cad7fffbe3efb0a8bc6b6c1165317
font_02_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 12248 bytes
SHA-256: 5f72afd411f5dd417f7950c580f9e5dcbef18ae77411451d52fd7629b32b033c
font_03_sfnt_off00013565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13565 17660 bytes
SHA-256: 05f5f24bd41c915d0e8e1f96160c35e4c3a73c6355df4691c6fcac5597beed7f