Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1118100ead0b4a…

MALICIOUS

PDF

70.0 KB Created: 2021-02-18 02:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ad131b5dd33f74c519baa7c2d78fd709 SHA-1: 8cb69f9e04e286ffd37fbd5f568e2724eb5d543e SHA-256: cf1118100ead0b4a6bf7dd0826d6b0723bfe9c6f6203eb22866298c1bd5e8119
252 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=robert+d+campbell+junior+high+school+boone+avenue+winchester+ky In PDF document text
    • http://vinograd.io/sharpen_image_photoshop_action01wx9.pdfIn PDF document text
    • http://doucheapp.xyz/how_to_fix_a_ti-84_plus_ce_calculator7zqen.pdfIn PDF document text
    • http://grenkasalo4.xyz/hayward_salt_cell_problem_detected88crz.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/66a2d87ad7abeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5ff249e6b5191.pdfIn PDF document text
    • https://cdn.sqhk.co/palezubifo/g1AX8ja/war_of_worlds_2019_season_2.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/Ngdibgc/simple_doubly_linked_list_program_in_c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455876/normal_600e4be5d4ad0.pdfIn PDF document text
    • https://pabidiwamudobav.weebly.com/uploads/1/3/5/2/135299897/19dcc.pdfIn PDF document text
    • http://tb-films.ru/quimica_inorganica_libros_gratisqhc9b.pdfIn PDF document text
    • https://giwizakewat.weebly.com/uploads/1/3/1/8/131857916/gikolebumuxudeti.pdfIn PDF document text
    • http://mikrotikwizard.com/gusibekonediwetovezigopus9f094.pdfIn PDF document text
    • https://jetakazam.weebly.com/uploads/1/3/2/8/132814031/lifebujewe_dorafudobob.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/juvodekujopuvogek.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/gjYXpkJ/31195554859.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_off0000d280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 6028 bytes
SHA-256: dbfa435d43e613e8ab608bc1fbf6239b99f41128ecb3ede24f0033c055bbf439
font_01_sfnt_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 10476 bytes
SHA-256: 46032b6844ea41b66f4f7e315aa4da2fc34833a085fe7d62946abe3edbbb7b05

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