Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef272928315aaa7e…

MALICIOUS

PDF

70.6 KB Created: 2020-11-09 21:27:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 101da700d099c5d8ddb3814194eb5691 SHA-1: 1d6d7e9e569ba16683c9262984b338fa7b8a5106 SHA-256: ef272928315aaa7e47ebd941b4dcee99ff4f982b30c3a683c703d10ee6d7023b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many pointing to disposable hosting services and at least one known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware download sites. The document's structure suggests it's designed to evade simple analysis by presenting itself as a benign document while hosting a network of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://traffking.ru/123?keyword=btd5+mr+goober+games In PDF document text
    • https://ludekomu.weebly.com/uploads/1/3/4/5/134505051/1429051.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/578063.pdfIn PDF document text
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/xekiwebene.pdfIn PDF document text
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/bofirovudi.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/661874.pdfIn PDF document text
    • https://xuxuratedagofat.weebly.com/uploads/1/3/4/6/134644764/junuxijijapelav.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/9528317.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ee675a-f8a2-40fe-97b3-c88634dc7043/neo_melubrina_infantil_dosis_5_aos.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/senior_staff_accountant_job_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf7f2ec-99e5-4a44-8db8-8deccf6643ed/bret_hart_wrestler_net_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68601dd1-7d77-4f3d-9607-aa0e493ce101/wilderness_survival_merit_badge_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb88882-2bb5-4884-b04b-dd73eb9c2649/cycle_country_plow_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/case_study_of_international_marketing.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_off0000c9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DF 5428 bytes
SHA-256: 4bc3b73c80ea63895a4e8ed754e51ee8b443d8b5ec0fae09336992749308b815
font_01_sfnt_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 2944 bytes
SHA-256: 03621652d10fb600abcbe8c31ed6680bc298fb16a6360f8de22481a905398700
font_02_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 11880 bytes
SHA-256: c0c9f3ffff3e1c27ac866c314fb065754d93b7d3fd4fb36edb1db1946c220b0f

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