Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ff6a8f5339b0f8…

MALICIOUS

PDF

75.4 KB Created: 2021-03-09 05:10:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83dd86f286571b2fa762de6d62b2d2f8 SHA-1: 964b1424b935521627872733db92f17f65bcd4e2 SHA-256: 12ff6a8f5339b0f8a40a5ceda34104e9ecd1914e9020e1bda270993f3b4327b7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/award?keyword=shoulder+dystocia+maneuvers+pdf
    • https://jinimajaloxole.weebly.com/uploads/1/3/5/3/135314869/a18b947cb69472.pdf
    • https://cdn.sqhk.co/dudazume/GFH8Ngg/53314565487.pdf
    • https://lixojubenolida.weebly.com/uploads/1/3/4/3/134375882/kelezubep.pdf
    • https://cdn.sqhk.co/nomowaxiwo/ibejaXf/clash_royale_hack_gems_no_human_verification.pdf
    • https://zamamuxito.weebly.com/uploads/1/3/4/2/134234866/sibozajimedo_tobuganafopel.pdf
    • https://cdn.sqhk.co/fonixoligem/Ijdjb4I/41088329029.pdf
    • https://cdn.sqhk.co/relulapezele/jiijbHf/youtube_super_chat_apple.pdf
    • https://cdn.sqhk.co/sesexibanobu/eD12HSd/newerazizisup.pdf
    • https://cdn.sqhk.co/zifeduwa/Wzifwig/dinoland_disney_florida.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/377e4c16-80a9-401f-ab08-9cc33f287d02/muwuwunelirezokodolulew.pdf
    • https://uploads.strikinglycdn.com/files/caffee1e-0ea5-4dbf-8ce3-dd7f5eecfd37/dd_3.5_equipment_slots.pdf
    • https://uploads.strikinglycdn.com/files/c4c3aa98-21e1-4d49-9ed0-5f5cf3541fff/21329688715.pdf
    • http://watenuwinigakek.epizy.com/chocolate_movie_song_in_tamil.pdf
    • https://s3.amazonaws.com/lomuper/mibijamuritame.pdf
    • https://uploads.strikinglycdn.com/files/8895e6d3-01d8-4b87-b362-571e75bb7f10/ikea_double_bed_frame_white_metal.pdf
    • https://s3.amazonaws.com/timeziso/all_american_925_pressure_cooker_manual.pdf
    • https://uploads.strikinglycdn.com/files/5d04b0c7-5160-432c-8f30-c4214b58c0d3/zte_z222_sim_card_size.pdf
    • https://s3.amazonaws.com/jeponowon/92071624229.pdf
    • http://netifikapiwi.epizy.com/lidekizinagesexuzomebid.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_off0000e97c.bin
fb44e4358e7d4429925bded8a4004de17a3b2fb780c8b553211a63784dca73f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 5660 bytes
font_01_sfnt_off0000fcaa.bin
b0f530fa8e4b3bd5bd0f998c0e2d18cc7211eb52bdee99c3a83d482f2d26c8fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 10548 bytes

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