Malicious PDF — malware analysis report

Static analysis result for SHA-256 742677ca991ee1c9…

MALICIOUS

PDF

71.5 KB Created: 2020-12-16 19:34:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0c55a13c7ef05db747859be622da8e42 SHA-1: 16f4ffdf130f401ca5f0e2a3349cfea4ef3695b2 SHA-256: 742677ca991ee1c9c7d54cd805fefb217c1e3b7c8ea2f60952913135daa3402f
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'Hamlet crossword answers'. This suggests the PDF is part of a link farm designed to redirect users to malicious sites, likely for phishing or malware delivery.

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://traffking.ru/123?utm_term=hamlet+crossword+1+answers In PDF document text
    • https://redilabow.weebly.com/uploads/1/3/4/3/134316718/nadebidisi-kexosi-mavomezuwopej-jatuze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454562/normal_5fc417f1d1ae6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424040/normal_5fcd89381d86f.pdfIn PDF document text
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/dedimibafidem_bugobip_bizofaxilurudu_zopubu.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/7014743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_5f91181c680ff.pdfIn PDF document text
    • https://vapifeti.weebly.com/uploads/1/3/4/7/134762900/foful.pdfIn PDF document text
    • https://jixobufasov.weebly.com/uploads/1/3/4/3/134324480/1802548.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/bekajudidarilab_xisigumutedi_felebodujuso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530070/normal_5fc65df74fa4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_5fb5f9f31554d.pdfIn PDF document text
    • https://zazokovorif.weebly.com/uploads/1/3/4/3/134321981/wagojasenulufuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408002/normal_5fbf066337d80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gotijejaj/abbasid_caliphate_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/29959840563.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_off0000cf0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0B 4932 bytes
SHA-256: 11448c84c3487cea2613106a0bb711e0c4ae9271862ea53b5b23d11871ec64af
font_01_sfnt_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 10420 bytes
SHA-256: f4920b2bc3890f41f430123cfe8316c1ee7f553623a070c975d302dcba8a5706
font_02_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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