Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0da292fe87bc7dc…

MALICIOUS

PDF

67.8 KB Created: 2020-11-26 06:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b73d9cfaa314ddafc5565295ce71e306 SHA-1: 26a5a880351021f11529d789c185e20aecca6243 SHA-256: a0da292fe87bc7dc79e772cc63773b0457d68a9de8056e35d08bb84b37df5d08
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document's structure and embedded links suggest an attempt to direct users to potentially harmful websites, likely for phishing or SEO spam purposes.

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
  • 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://cctraff.ru/strik?utm_term=stephen+king+langoliers+netflix In PDF document text
    • https://lebotuzipum.weebly.com/uploads/1/3/4/5/134519329/kudol_tovugufefifiw_wugedigajefu_nubewamobulo.pdfIn PDF document text
    • https://zemonawajut.weebly.com/uploads/1/3/4/6/134688337/6987684.pdfIn PDF document text
    • https://nepubodi.weebly.com/uploads/1/3/4/6/134610278/d233ae27.pdfIn PDF document text
    • https://vofixerexelisat.weebly.com/uploads/1/3/4/3/134311693/peboni.pdfIn PDF document text
    • https://gawubodukajine.weebly.com/uploads/1/3/0/9/130969599/dewaraxiz_rivupopakoz_gewavoxakofoxu_pezoloxa.pdfIn PDF document text
    • https://gikeviviku.weebly.com/uploads/1/3/4/7/134707445/9f8bb7b5a7358.pdfIn PDF document text
    • https://piziruzebizopu.weebly.com/uploads/1/3/4/3/134350425/suvuxupixekimuzule.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/wupozowefunalenem.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/77af4b997.pdfIn PDF document text
    • https://mubuvume.weebly.com/uploads/1/3/4/8/134885019/bekibuvurup_gawiximo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5f931c804985d.pdfIn PDF document text
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/5632cf54f14.pdfIn PDF document text
    • https://rugitaroginuwim.weebly.com/uploads/1/3/4/7/134768051/pilesinere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455374/normal_5fad5e781cc90.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/f19191da-fec3-44cf-b08d-242eb6cc844e/dennis_cooper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b2ca66-7add-4003-b1d5-2e4605b05bb9/papa_louie_pizza_attack_game.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_off0000cc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 5400 bytes
SHA-256: 56db49b10d653c53894e3ccd204cbb9953d5a51d1fce10deff8023bdc517d5cc
font_01_sfnt_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 10492 bytes
SHA-256: d580fd4aad19fcfe46d0d3533abc6f3ef6bfe763df7abbcc3d940b72ca7449d9

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