Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f6b5ed35f1fea7…

MALICIOUS

PDF

73.7 KB Created: 2021-05-12 14:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 78f1bbbdef791bbfde47f822a2f46ac4 SHA-1: 7538e9fa2824545dfdba42f33eef7e1bb9494626 SHA-256: a6f6b5ed35f1fea7653a4b0989a50acb530d27c391d6666e0b4191f833cb05c9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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
  • 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://dafemum.ru/strik?utm_term=sheridan+blue+streak+serial+number+location PDF link annotation
    • https://gipavibipo.weebly.com/uploads/1/3/4/6/134654588/paluzi_zezukafifav_genobevetuziw.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/14284047910.pdfIn PDF document text
    • https://cdn.sqhk.co/vagewovupug/mhcjdjh/huey_magoos_salad_calories.pdfIn PDF document text
    • https://cdn.sqhk.co/jitegoji/chegjaW/37805636134.pdfIn PDF document text
    • https://cdn.sqhk.co/joxutedunik/idnDgfU/project_manager_resume_job_hero.pdfIn PDF document text
    • http://nubemeketetu.mypressonline.com/fovamopejo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375200/normal_5ff7768c8937b.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/dr._seuss_sleep_book_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jipuxoxukul/alKhfGg/3936438672.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480905/normal_5fe071c470c1a.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/4e754e5257d20.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/tazofexefelerinisijol.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/que_es_el_gnosticismo.pdfIn PDF document text
    • http://ferafukapawap.scienceontheweb.net/xaxopawajewuneniz.pdfIn PDF document text
    • https://butapakenora.weebly.com/uploads/1/3/1/8/131871909/gosabibowis-bizisasorad.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/068986b6-9431-48c2-86f2-99ff0e13fbc6/compound_interest_math_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b064e5d1-4268-4e7b-b3e4-f3a29d25e078/88904153146.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 5488 bytes
SHA-256: ca7eeb125ceaa1a0f5befe928e46fce2a465f275b5dc4022e510669dbbf12415
font_01_sfnt_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 10588 bytes
SHA-256: 0d735892210d5d6264dd9efb5a4532bbf0ca9a9745e8a4c3015dd83225eb6135

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