Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cb6298d1fcc93c…

MALICIOUS

PDF

62.8 KB Created: 2021-02-15 08:33:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e83eca4bb10b7ae13c6aa3fe37ab47e3 SHA-1: eefeec73fc9d1880355ea17b08666b216b18ad16 SHA-256: 44cb6298d1fcc93ce20bdb023175aab29d0670010cc8d9e48675b7fce8a082a3
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or known redirector infrastructure, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'Fahrenheit 451' and application metadata, likely as a lure to disguise its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=study+guide+questions+for+fahrenheit+451 In PDF document text
    • https://cdn.sqhk.co/nixibaraje/goihdIW/hokey_pokey_dance_gif.pdfIn PDF document text
    • http://ecoservice-vlad.ru/wewajileg0gpg.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/Brtghgi/18145089957.pdfIn PDF document text
    • http://shortsomfj.space/132731894883pi9j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_600a3eb87a7d4.pdfIn PDF document text
    • http://rewita.fun/download_knife_hit_mod_apk_unlocked_all_knife99jop.pdfIn PDF document text
    • http://knitfqph.site/737645613589fozj.pdfIn PDF document text
    • http://ig-copyrightnotice.com/vurulusobowuvzvybv.pdfIn PDF document text
    • https://cdn.sqhk.co/mebinolopuf/5e2BhgJ/glory_ages_samurais_apk_download.pdfIn PDF document text
    • http://snatural.space/tinker_tailor_soldier_spy_noveleku42.pdfIn PDF document text
    • http://c-advance.space/55179657029ve0uf.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/ifXZ0fT/lone_survivor_netflix_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/jetuzama/Ojdxjel/apple_game_center_server_down.pdfIn PDF document text
    • http://pubgucbayim.com/tilusitepufowujelowowilans5mx.pdfIn PDF document text
    • https://cdn.sqhk.co/paxabuxutujo/a2TqMjc/67523516252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454559/normal_5fdb2871d28b2.pdfIn PDF document text
    • http://idealica-italiaofficial.site/conformational_isomerism_in_ethanem311q.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_off0000b94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94F 5732 bytes
SHA-256: d6a82d30d76f330957426f14e5cf20d544e40ced8d2f92bd904a29716bd015ba
font_01_sfnt_off0000ccdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDF 9804 bytes
SHA-256: 009cf3166c0cf50c5e4d1682e7c48e6faad0df0f0f7dcb0d89d31968b1b599f0

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