Malicious PDF — malware analysis report

Static analysis result for SHA-256 591ee6ab814e8a17…

MALICIOUS

PDF

79.2 KB Created: 2021-02-26 03:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f9e47b72225aa4f54a6857657a9c922f SHA-1: aaba58ffdee5e80527c857afbd9399262db48846 SHA-256: 591ee6ab814e8a17b45aca2d497685ff3a1e0558662f1ec96f98c3070485ec5c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, flagged by heuristics as malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

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://crophysi.ru/strik?utm_term=the+lightning+thief+musical+playlist In PDF document text
    • https://static.s123-cdn-static.com/uploads/4420589/normal_6007d1321aa21.pdfIn PDF document text
    • http://poradoit1.site/five_point_scale_examplesdkxuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421061/normal_5fefc1d1ce7a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_6031671bf370e.pdfIn PDF document text
    • http://rfs.team/epidemiologi_aterosklerosisb82bu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412387/normal_5fdc25d677c61.pdfIn PDF document text
    • http://good-production17.site/fegubimodegiteronikuzecqan0.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/hGhdhef/47790199289.pdfIn PDF document text
    • http://golosa-spasibo.ru/pozitereioojf.pdfIn PDF document text
    • http://starconflict-game.ru/thrill_of_the_chase_poem_and_maptnqaa.pdfIn PDF document text
    • http://topcreditcheck.info/amma_songs_in_telugu1nu1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414848/normal_6018686379703.pdfIn PDF document text
    • http://kieverts.xyz/sibedetu7sy2p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501229/normal_600c4f4f06167.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitejilid.epizy.com/barcode_reader_scanner_android_app.pdfIn PDF document text
    • http://zitejilid.epizy.com/big_forehead_meme_template.pdfIn PDF document text
    • http://beposutixavi.epizy.com/basura.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_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 5384 bytes
SHA-256: d645c8a362022c7d7d1ff00ed6139fcdbf64c4b9ebef182e4e597849fffa70d2
font_01_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 11428 bytes
SHA-256: eb44b1d20dda0216451f0fac2b07c158b974d99da4ba871a7ba59192668b57a4

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