Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c36c6afadf81656…

MALICIOUS

PDF

73.3 KB Created: 2021-02-21 15:42:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6a07e368ba7ccf1176b43942eb76d7d5 SHA-1: ae301bcb1628dbcb0a7e5bef65643962a9059e39 SHA-256: 9c36c6afadf8165648c448eeccb1012bec6abb01e93004156bc3c544f6c5c481
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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/strik?utm_term=canon+powershot+sx100+is+digital+camera PDF link annotation
    • https://cdn.sqhk.co/xekemini/XziiPFc/kanto_region_event_pokemon_go.pdfIn PDF document text
    • https://wavixozuxukoreg.weebly.com/uploads/1/3/1/3/131380445/tigege.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403117/normal_5feeca25e43ce.pdfIn PDF document text
    • https://cdn.sqhk.co/digatamale/b35HLim/kpop_usa_online.pdfIn PDF document text
    • https://wosuletoxo.weebly.com/uploads/1/3/0/7/130739711/85e24a5.pdfIn PDF document text
    • https://xikipavukageza.weebly.com/uploads/1/3/0/7/130776529/xifupuvonixa.pdfIn PDF document text
    • https://nomomiwadij.weebly.com/uploads/1/3/3/9/133997716/laribizogirax.pdfIn PDF document text
    • https://gugeropufil.weebly.com/uploads/1/3/0/8/130874104/5684427.pdfIn PDF document text
    • https://zovezeko.weebly.com/uploads/1/3/4/6/134697242/xiduf_dewuw.pdfIn PDF document text
    • https://nifisutabunus.weebly.com/uploads/1/3/4/6/134634245/2106700.pdfIn PDF document text
    • https://cdn.sqhk.co/wisulekekij/igdlpha/cool_baby_boy_names_that_start_with_a.pdfIn PDF document text
    • https://fexagoresex.weebly.com/uploads/1/3/4/3/134337575/7250660.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/jarawaxanivu/security_testing_interview_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/business_information_systems_starting_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/boogeyman_2_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/how_do_i_change_ownership_of_a_kindle.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_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 5744 bytes
SHA-256: 93a3c4e106857f03177747bd6999789728c3f865b097656758c19a0f661ea42a
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 11124 bytes
SHA-256: 0c1123864aa15d0fef5a910c4815da4f076c48654eeba72bd574bfbecee1b577