Malicious PDF — malware analysis report

Static analysis result for SHA-256 28549e55888f884d…

MALICIOUS

PDF

76.3 KB Created: 2021-03-12 15:00:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1f9dec5733598e2eedc835ad81db12a SHA-1: 5531a6149ff19fd36a5fc5ba46c27ca404f5521a SHA-256: 28549e55888f884d567b4c07131b3c971b6ec931ce195af6fc267528c76fc547
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous external links, with many hosted on disposable domains, indicating a link farm or phishing operation. The PDF_SEO_LINK_FARM heuristic specifically flags this behavior, suggesting the document's primary purpose is to redirect users to a network of related sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jumiwimov.ru/award?keyword=the+way+up+to+heaven+francais+pdf
    • https://sezitekiporav.weebly.com/uploads/1/3/4/6/134627959/08ba6219a2a.pdf
    • https://falibapop.weebly.com/uploads/1/3/3/9/133997194/bakanigolekabe.pdf
    • http://potawuzaj.medianewsonline.com/85450128378.pdf
    • https://pisubudanumiz.weebly.com/uploads/1/3/0/8/130874058/263f5a56901.pdf
    • http://hookup681.site/aptitude_test_question_paper0mnl7.pdf
    • https://cdn-cms.f-static.net/uploads/4366007/normal_6031ee7ba72d9.pdf
    • https://cdn-cms.f-static.net/uploads/4491159/normal_5fd672096b38b.pdf
    • https://regezubigif.weebly.com/uploads/1/3/5/3/135320660/65d3146b4.pdf
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/gidodekiwenoka.pdf
    • http://online-bestshop.xyz/ejercicios_resueltos_funciones_del_lsp71l.pdf
    • https://tupetemen.weebly.com/uploads/1/3/0/7/130738754/wozoxogewujoku-toduwufus-sorerazaxatewid.pdf
    • https://wuwemupijebuvat.weebly.com/uploads/1/3/4/0/134012408/ae912c70f75cf29.pdf
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/8388408.pdf
    • http://detonic-official.website/vupowepopatigumiduduvikr77o.pdf
    • http://galosidijixiwu.mypressonline.com/car_sales_contract.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tezofuretejom/tecnologa_de_la_informacin_definicion_informatica.pdf
    • https://s3.amazonaws.com/fatikonavori/nixogawexu.pdf
    • https://s3.amazonaws.com/fekife/how_to_make_microsoft_word_dark_mode_windows.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_off0000ede4.bin
02627f655d53655eb066eb50b8a74d950275a38e2ab296b31d026640e8918c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 5412 bytes
font_01_sfnt_off00010069.bin
b356940cced25f71f78c4b4541c26131e10f4a23bafdf1f7d5612ad2324bac42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 10908 bytes

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