Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d54669969fb6901…

MALICIOUS

PDF

79.4 KB Created: 2021-03-28 05:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b380d2e8cecb2e9143b6bd70f0c5df45 SHA-1: 9ef9f7e32bf6168072225ed812ffe924358c6f5a SHA-256: 7d54669969fb69018667c0503f22c1d61831dbb43cad03195d2874ca787713b6
186 Risk Score

Malware Insights

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

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 0.9996

Heuristics 6

  • 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 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.
  • 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://resalured.ru/strik?utm_term=stumbling+into+happiness+review PDF link annotation
    • http://madusotiju.22web.org/16189645778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_5fd67ded2028e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470552/normal_601047113179c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_60470dc4af38b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_6031242228fa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_600e6a63d329f.pdfIn PDF document text
    • http://bibunom.iblogger.org/ias_botany_notes_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426556/normal_604f63fba672a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_6053bd484bfbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5fc87c3295178.pdfIn PDF document text
    • http://keepmaxi.space/batangas_state_university_college_application_formg842v.pdfIn PDF document text
    • http://prizinsta.site/gigizexawijozipugekujo6zbq2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rubidokezive/risperdal_consta_dosage_forms.pdfIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_4b19d4b6f59945d5b9d5f93c22f0f46a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/88170792658.pdfIn PDF document text
    • http://fobifuv.epizy.com/75402170503.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/28930666047.pdfIn PDF document text
    • http://puwagof.rf.gd/six_sigma_green_belt_project_report.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_1b7d3b2e0cec40d1b9325a17ccd610d0.pdf?index=trueIn PDF document text
    • http://fosisidevafepet.epizy.com/daxipiretowifaxowemagol.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_c5141bcbcf224aaa8c29ac3d808059fc.pdf?index=trueIn 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_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 5512 bytes
SHA-256: bdbf9cade0c980a3f0ed4379334b7f6f48e3c3e32644b6456a9ec239a5c6cc3f
font_01_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 10984 bytes
SHA-256: 97573175f0a64e17953511bad12717981c7cb7b028452897b0d1bfcfb5e03abb
font_02_sfnt_off0001225b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361