Malicious PDF — malware analysis report

Static analysis result for SHA-256 e959b1e9ff1a0f62…

MALICIOUS

PDF

78.0 KB Created: 2021-06-12 03:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 16a6a4e44b9b269a53ceca05ab741e40 SHA-1: 3c18518643940b6603acaa5362d3376c7ea28753 SHA-256: e959b1e9ff1a0f621451ef815ced45cc35324ff2219f4080e219d8b05b4fbeff
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to disposable hosting or redirectors, indicating a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution vector. The ML classifier and ClamAV detection strongly support the malicious classification.

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://yafferge.ru/123?utm_term=anabolisme+fotosintesis+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470681/normal_6052b23a52e24.pdfIn PDF document text
    • https://fekanefitogi.weebly.com/uploads/1/3/4/3/134340372/4b929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_5fe7be5b68a1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_6020aace0b121.pdfIn PDF document text
    • https://nudetotiba.weebly.com/uploads/1/3/4/8/134872476/mutujolas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466996/normal_5ff8659144ff2.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwolufit.pbworks.com/w/file/fetch/145103076/67278008374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7c21c09-2bac-4ccb-80c4-6249efe4dee6/afterburn_aftershock_sylvia_day_goodreads.pdfIn PDF document text
    • http://kefatezalix.pbworks.com/f/46771355535.pdfIn PDF document text
    • http://zeranagaro.pbworks.com/w/file/fetch/144677589/green_card_interview_questions_2019.pdfIn PDF document text
    • http://febigadeviti.pbworks.com/w/file/fetch/145115091/best_screen_and_internal_audio_recorder_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca046b11-447e-4f2f-8a0b-208b675bb878/78907077646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0d66cf-827c-4c1c-aba9-bdbb5461be2f/how_to_light_quadra_fire_pellet_stove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c81b5130-64a4-4f52-82ce-f22595807214/25654243221.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 1548 bytes
SHA-256: 1c4c67c6369b62ce2282e335e2979c7e4847daec907d095debb04ce607726cc3
font_01_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 5220 bytes
SHA-256: 6a703d3fc89043cfacce8de15d518e5fe8ee369c5b377a5883b75ff2fc10bf9a
font_02_sfnt_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 12044 bytes
SHA-256: b9ea28f62904ce80b7f3f7a0e0e74ccf7702c24091ae0b29f5e564186bba843e

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