Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e0025a351f33b8…

MALICIOUS

PDF

78.3 KB Created: 2021-03-17 03:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1bb1b4a0e7840723ec4db856d0db6fe SHA-1: 9c8ac2c0d28bc98d8ec39dbc997908fecf49ad2a SHA-256: 25e0025a351f33b8ca7cfe07c3adde25b5b393affa538a1f026f450abb39dd70
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, a common technique for SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the PDF structure itself is indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=the+norton+anthology+of+english+literature+pdf+9th+edition
    • http://gixipures.sportsontheweb.net/digob.pdf
    • http://buwovavozu.getenjoyment.net/momazenomabubijubitosu.pdf
    • https://cdn-cms.f-static.net/uploads/4478685/normal_5fdc420f8828c.pdf
    • https://cdn-cms.f-static.net/uploads/4371505/normal_6026919fec616.pdf
    • https://cdn-cms.f-static.net/uploads/4421214/normal_6025214500849.pdf
    • https://cdn-cms.f-static.net/uploads/4480884/normal_5fe6bb673c5a2.pdf
    • http://fuxezaboxekave.scienceontheweb.net/livro_em_gratis_capites_de_areia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lugivodunoxasi.atwebpages.com/elementos_arquitectonicos_romanicos.pdf
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_a089959dca4946d58346444a35a6ee43.pdf?index=true
    • http://teraropabu.epizy.com/how_to_put_a_razor_in_a_safety_razor.pdf
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_22cffde09e0e4cbeaa666d5b0dc27b7f.pdf?index=true
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_30ecb7752c2243338e8d0fd98e3442b8.pdf?index=true
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_a529d31dd57644c6b4ee7b16f7dc082e.pdf?index=true
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_b1ab50539bf542378d60d0bd352984f4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9401efb5-7530-4c06-ae40-63a0fb9ec316/bulib.pdf
    • http://noniwelabezona.rf.gd/mulapiwiluresuxaguxanag.pdf
    • https://uploads.strikinglycdn.com/files/03765ef0-7321-4bc3-8244-7020b5bda813/how_to_fill_parent_declaration_form.pdf
    • http://zozafiromilofin.epizy.com/degukuxikevogubob.pdf
    • http://mudalulox.epizy.com/i_loved_her_first_piano_sheet_music.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_off0000f305.bin
03e23dbc4116bdccdca4aa5afb0a8e8b18b434e62404220bab3ad06510c428c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 5508 bytes
font_01_sfnt_off000105c6.bin
b46816a21e31879a865f7d640fdd3342f63185fa36320b7bf44ebcc88a50d4c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 11112 bytes

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