Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81d852af75edd75…

MALICIOUS

PDF

71.0 KB Created: 2021-02-21 07:33:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 05bf8fd3fecc1e708bbe5b8e98d9d7e9 SHA-1: 9d08994f3b9c718a76c9fe11427fe14fc7858fc6 SHA-256: c81d852af75edd7558dc59e4e1a42a99c5eca7ad0e674436904bc5f7178ffd64
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting or known redirectors, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=we+make+the+road+by+walking In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391319/normal_6024cbe81ef76.pdfIn PDF document text
    • https://mojikusabuja.weebly.com/uploads/1/3/5/3/135301399/telivunadumuwibibu.pdfIn PDF document text
    • https://fojevuresuzuj.weebly.com/uploads/1/3/4/8/134881640/bakapituxezil.pdfIn PDF document text
    • http://itravelimpressions.com/intrusion_detection_system_project_reportwythn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367920/normal_5ff3c07311919.pdfIn PDF document text
    • http://reduslimer.website/manitojejubuxedelujusezebiw6sw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382962/normal_5fc9dad287892.pdfIn PDF document text
    • http://ueuniti.website/born_to_run_tour6xulo.pdfIn PDF document text
    • https://cdn.sqhk.co/wisivelu/vGjb2bH/junalusirijireju.pdfIn PDF document text
    • https://fusavufotopos.weebly.com/uploads/1/3/4/6/134634064/2964449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_5fd103e371ed5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_60155986b90b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_5fe6e29c58ae1.pdfIn PDF document text
    • https://cdn.sqhk.co/pajazidif/dhcLvjj/kitchen_story_cooking_game_hack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 5472 bytes
SHA-256: da40507764764c0fd997de79e4d76e0800da097a1947dcab263410755d1995bb
font_01_sfnt_off0000ea2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 10940 bytes
SHA-256: 6e55bf171d7e08ae8c6180da95c5e3020c00f7a8e93c036be9862dbaa287a8cc

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