Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5308ead64aaf50…

MALICIOUS

PDF

73.9 KB Created: 2021-05-05 16:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d07fac1602660c3a0355d31a051b7057 SHA-1: 2730fc544d88f4083cd6e05955214d6dd5838f67 SHA-256: cb5308ead64aaf5037db022ab144e135db9ec86822fb19b1152a30af22c0fb1d
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially malicious or unwanted content, aligning with a phishing or content distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://ponafet.ru/strik?utm_term=heil+furnace+blower+motor PDF link annotation
    • http://gixipures.sportsontheweb.net/56125112195.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikijun/qFbhejb/freshwater_coin_pearl_drop_earrings.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/tivud_tizasu_fagaduz.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/PyASEgj/4988029883.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/uterine_fibroids_guidelines.pdfIn PDF document text
    • https://nazorilorapumug.weebly.com/uploads/1/3/0/7/130776423/tewasatuvijejijukim.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/gijahfU/modern_poweramp_visualization_apk.pdfIn PDF document text
    • https://rupusuji.weebly.com/uploads/1/3/4/8/134878943/gixesi.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/wLOnfjd/nokir.pdfIn PDF document text
    • https://tedaliduvif.weebly.com/uploads/1/3/5/9/135957254/7950710.pdfIn PDF document text
    • https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/sifuduronimalot.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/causal_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/galudubujuwa/i2hiyzH/zewekuxufulumepizatawi.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/hiiiC5q/android_software_update_kaise_kare.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/09600cf3-7f04-40ed-b4a2-28f8f3572115/vedisal.pdfIn PDF document text
    • http://kulebosux.myartsonline.com/paintball_san_jose_de_maipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/375193ce-2dbc-4578-9eeb-c2a325179376/25868296890.pdfIn PDF document text
    • http://wumugajus.onlinewebshop.net/79926597776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9906d2ee-12fd-48cd-a7c6-7fb702aaef42/how_to_train_your_dragon_3_trailer_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb4a70e-b81a-47e3-80e2-34ef3cc75605/19314584988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464b96cf-1c15-42b4-8106-1abfe9e4d2c6/brown_v_board_of_education_of_topeka_court_decision.pdfIn PDF document text
    • http://zozusanom.epizy.com/vuzirogowetitutetapuku.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_off0000e6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 5044 bytes
SHA-256: 29c8b8e09886ce7febd76a931b5a71dfba09372f2128d59e5cd76c146634bbf1
font_01_sfnt_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 10036 bytes
SHA-256: 12a7690d5e60da9f704a833b992b5805cba06b4ec2b80666ddae0d81f7fbdcc1