Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20547ab35b4fe4d…

MALICIOUS

PDF

73.7 KB Created: 2021-03-09 07:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 10c39b235e179d4bde19a827776e676f SHA-1: 11bd106b4f67f8a7ea0de5c3731555f9cd0f8c57 SHA-256: a20547ab35b4fe4d4ddf8e9b384030ef34e5d786b775d49fe0017dfb87e34c86
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as a malicious redirector and link farm, indicating it's designed to lead users to harmful content. The embedded URLs, such as 'https://yafferge.ru/123?utm_term=academic+essay+writing+guide+pdf', are part of a strategy to distribute malware or conduct phishing. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a phishing lure or a downloader for second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://yafferge.ru/123?utm_term=academic+essay+writing+guide+pdf In PDF document text
    • https://cdn.sqhk.co/vomisape/jd3yTOT/equalizer_hitch_installation.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/zjb6VCs/18828311294.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/jivafami-sugun.pdfIn PDF document text
    • https://cdn.sqhk.co/sukijubese/BhjzYYe/pew_pew_live_stream.pdfIn PDF document text
    • https://zabodoxukuxubar.weebly.com/uploads/1/3/4/9/134904472/6629821501b20f5.pdfIn PDF document text
    • http://pazefezos.mywebcommunity.org/vaxoretujuga.pdfIn PDF document text
    • http://ca-management.website/brother_hl-l2370dw_turn_off_wirelessye46e.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/hoBV1b9/gears_of_war_4_gameplay_split_screen.pdfIn PDF document text
    • https://tugagofinose.weebly.com/uploads/1/3/0/8/130874012/limazaguwegoxuro.pdfIn PDF document text
    • http://scarcebook.com/rope_cutting_knifegmpn4.pdfIn PDF document text
    • http://tevfikyuce.xyz/mobile_repairing_books_free_download1j37n.pdfIn PDF document text
    • http://cabinetshub.xyz/badrinath_full_movie_video59eeh.pdfIn PDF document text
    • http://test123test.xyz/rivadagomesatevupuzuzakolb4x.pdfIn PDF document text
    • https://figagukedeliv.weebly.com/uploads/1/3/4/0/134040575/50beb5ed8bc78.pdfIn PDF document text
    • http://xsale.trade/314130058633yby1.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/what_is_the_salary_of_a_certified_medical_assistant.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://megigezorozo.atwebpages.com/4766195546.pdfIn PDF document text
    • http://javasuk.epizy.com/zatupaginewakiwi.pdfIn PDF document text
    • http://doxewos.epizy.com/waragozixugisu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 5624 bytes
SHA-256: 13cc75960249a89a159faa6f0ebea046e28a1c5c5e4f7cc28b2921482ee7d67b
font_01_sfnt_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 10156 bytes
SHA-256: bd443212e2a709b8b1eb77cecffc63969a955057e23dff78df4c7ef0440d26f2

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