Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e0c0fef10081fe…

MALICIOUS

PDF

77.6 KB Created: 2021-04-01 21:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6c1952d8a992a5dcabb22df466001285 SHA-1: cc3cc77c603db4c25761d5e6d1b7ff2bc36b2511 SHA-256: 12e0c0fef10081fee428f6286af925eb81044fee796c7e02fad1e176e9711fbd
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to disposable hosting and appear to be part of a link farm. The primary URL, disguised as a smoke detector manual, leads to a site that likely redirects to other malicious or SEO-manipulated content. While no scripts were explicitly extracted, the ML classifier strongly indicates malicious intent, and the overall structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/strik?utm_term=firex+smoke+detector+owners+manual PDF link annotation
    • https://cdn.sqhk.co/rafumufo/XhgAThh/kuzekijumigixi.pdfIn PDF document text
    • https://cdn.sqhk.co/mowibani/hcriige/islamic_finance_development_report_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/KXieiix/music_theory_guitar_class.pdfIn PDF document text
    • https://cdn.sqhk.co/wusuzevomo/9gcJhbW/world_chef_game_hack_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/wudajelu/jhcg0M0/11136120960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_604794c94d833.pdfIn PDF document text
    • https://cdn.sqhk.co/ronelejibir/hhfI6hi/digikey_electrolytic_capacitors.pdfIn PDF document text
    • https://cdn.sqhk.co/lidojuxuxiro/hijhjck/dugerexalekakediputuvuro.pdfIn PDF document text
    • https://cdn.sqhk.co/vidujubotaf/kHWjfia/audio_spectrum_maker_software_for_pc_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/OJWGhi5/81451675642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446930/normal_5ff55d3a774ca.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/ghHjejc/40207689086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454161/normal_600e9e49b3c38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_603b090daa289.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_cdde4ed40d76476a927d9ce13649d350.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d94708d-1cef-4595-a9b6-e967c0c97dea/66623173389.pdfIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_78302e005bd74e2b938ab8fc4770d931.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9418a8a6-4849-47b0-824a-732020f213ac/24589485460.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_693cb79be5b84a468fb4035123e0bd67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/949336a1-111c-4086-9305-9292c2779803/87430043309.pdfIn PDF document text
    • https://82a15d5c-09b3-4b2c-b6d5-cdf01964cb25.filesusr.com/ugd/5adcb9_9fe5cf92ff1e4fb387b4577743514c90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5468585-9d65-483b-9a95-c6f7897a9c1a/how_to_cheat_a_pot_of_gold_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/850dbe23-040b-494c-b61f-87725fdc06e1/convert_mini_dv_tapes_to_digital_without_camcorder.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_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 5264 bytes
SHA-256: 530a24f6f18207186fbf5e7137181040e2f3d5e9fff8c4edb05428a47d0d584b
font_01_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 10916 bytes
SHA-256: 5c41a4fb3637e62aef60f240364713409191131c1c172886387acc0f3f6640ba