Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8da9e80d3c352f…

MALICIOUS

PDF

71.7 KB Created: 2021-02-09 18:30:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d925b997e17cdd2310bd0fc3b3c1827 SHA-1: d699a5172694550884e736e375ec38c30e8a4539 SHA-256: 9e8da9e80d3c352f799ac3a959cce254a619205eb7898296f8359616a44190f4
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to a song and application details, suggesting a lure to disguise the malicious links. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=beimaan+piya+song++video
    • https://cdn-cms.f-static.net/uploads/4448724/normal_6010b721d49ee.pdf
    • http://samekado.22web.org/45748930348.pdf
    • http://idealicait.site/percy_jackson_and_kane_chronicles_crossover_book_3p1mkg.pdf
    • http://nisiwitas.22web.org/woruridezujonopa.pdf
    • http://jeruxawi.iblogger.org/zurolilinufexox.pdf
    • https://static.s123-cdn-static.com/uploads/4387054/normal_5fe24db1b4ad9.pdf
    • https://janodapos.weebly.com/uploads/1/3/1/6/131636969/a93d322cdb6b26.pdf
    • https://cdn-cms.f-static.net/uploads/4445125/normal_6011a87575444.pdf
    • https://cdn-cms.f-static.net/uploads/4472783/normal_601c8ad93f9ca.pdf
    • https://dagaroxir.weebly.com/uploads/1/3/5/9/135973008/7b480c5763bd71a.pdf
    • http://kuroramogesok.iblogger.org/subizilanipepiguw.pdf
    • https://bexokafosirur.weebly.com/uploads/1/3/2/6/132695536/perow.pdf
    • https://mosuvixixe.weebly.com/uploads/1/3/0/9/130969854/wanukul_birom_kifigotoso_vedepaku.pdf
    • https://vopesowe.weebly.com/uploads/1/3/4/6/134638419/topekugowop-sawoxar.pdf
    • http://dwatches.site/28807415440lkyxz.pdf
    • https://vowabogebem.weebly.com/uploads/1/3/0/7/130775978/708a06.pdf
    • http://raftgjgr.space/smart_ration_card_downloadejxcn.pdf
    • https://vojawafi.weebly.com/uploads/1/3/1/6/131636668/3878301.pdf
    • http://fruits-summer.fun/causative_exercises_multiple_choicer8g2s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pepebejawu.epizy.com/return_path_deliverability_report.pdf
    • http://fofilelajisemap.rf.gd/10898529120.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab7.bin
cb8168b5c3a82cbc20aead9bafe7b23f271ee81de0d4c53af3f3bb98388735bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 5364 bytes
font_01_sfnt_off0000ecf8.bin
64ebf9dc19efdbf558a76bd5e208cfd0002072b438b5205634a3742a010babf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 10692 bytes

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