Malicious PDF — malware analysis report

Static analysis result for SHA-256 674fa12e4a224100…

MALICIOUS

PDF

83.0 KB Created: 2021-03-25 00:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 51340b32861610f267522776ae4b2c3d SHA-1: 8795e9bab4d41c6e57eff647173adc6b9242c3b6 SHA-256: 674fa12e4a224100266beb84b48070e2287b2a27b60fcab80e7a840fe1789106
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://jumiwimov.ru/strik?utm_term=wheel+of+time+cast PDF link annotation
    • http://nozumupi.medianewsonline.com/bibiliya_yacu.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/ghCCigY/showed_you_my_answer_me_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/kabawamurelo/7ifBhdN/zoperobuzulesapaz.pdfIn PDF document text
    • http://kitixukizogutik.mygamesonline.org/43178413777.pdfIn PDF document text
    • https://mavukaral.weebly.com/uploads/1/3/4/9/134904766/nexopebipis-zasimonekamejab-fekebununer-pibexejogofe.pdfIn PDF document text
    • https://pejapuvurexoku.weebly.com/uploads/1/3/1/6/131636728/fofep.pdfIn PDF document text
    • https://xuxerativizujaf.weebly.com/uploads/1/3/1/0/131070719/8154b3.pdfIn PDF document text
    • http://suvolupijiro.mygamesonline.org/simple_application_letter_format.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/AEihaib/gravity_movie_summary_spoiler.pdfIn PDF document text
    • https://cdn.sqhk.co/kevapaboxer/m0jadYp/hd_wallpapers_desktop_backgrounds.pdfIn PDF document text
    • http://musomojil.mywebcommunity.org/29912492490.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/ghhgpji/science_journal_impact_factor_2019.pdfIn PDF document text
    • https://vanunogagasibe.weebly.com/uploads/1/3/5/9/135964710/1105169.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/79c982b3-19c9-4b73-a899-007e4b9eb2ba/can_i_add_uconnect_to_my_ram.pdfIn PDF document text
    • http://gajopule.myartsonline.com/does_jersey_mikes_have_free_delivery.pdfIn PDF document text
    • http://dezinolabebosod.atwebpages.com/40988040415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264f18c6-3b4c-4966-bc9b-782f14759ea9/vujorogogas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fdbbee3-2350-47ba-9f0c-4b4172f54cba/are_inverter_generators_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2409dad1-90d7-4bb3-9a49-692531513e59/vermeer_bc1000xl_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3b91d7-fe51-4528-9595-239b8dd599d9/77620430631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146295e7-b79f-47cc-8a90-37a668ec71b6/79157128837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3c8dd5-5267-4b94-be0a-f77b141123cf/pit_bike_engines_for_sale.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/python_machine_learning_course_udemy.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 4720 bytes
SHA-256: bd3ec3cb7d02fbb8bfa448961b591bbb771372ea6f8480bd292d295734ae6f1f
font_01_sfnt_off00010b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3E 10824 bytes
SHA-256: 8a9feaa365996e34712d34aa0de7e9bdefe4a5bcd4031a0b090ee66d63db1833
font_02_sfnt_off00013011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13011 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34