Malicious PDF — malware analysis report

Static analysis result for SHA-256 383825eb31029e3c…

MALICIOUS

PDF

71.7 KB Created: 2021-06-06 20:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a57339754ad008c7ee9be8344634a42f SHA-1: ad78fd60903ad404c185ae27c4a3cac3351fa401 SHA-256: 383825eb31029e3caac509acf7c2ab6cb45ddff4aa6d6379e11bf67638e077fe
186 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 phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://druttle.ru/123?utm_term=nf+can+you+hold+me PDF link annotation
    • https://zetodimamewiwek.weebly.com/uploads/1/3/2/3/132302859/sadiduriz_mudiru_gozekovomil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421341/normal_6019d7e4e55f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494431/normal_602bfd5c836f8.pdfIn PDF document text
    • https://difomojixi.weebly.com/uploads/1/3/4/3/134319012/0e74570dd481.pdfIn PDF document text
    • https://nobuwutuzuta.weebly.com/uploads/1/3/4/8/134884415/mudaxujin.pdfIn PDF document text
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/100f1024de8.pdfIn PDF document text
    • https://kadeborejegan.weebly.com/uploads/1/3/2/7/132740978/2f58e5f5d.pdfIn PDF document text
    • https://fizijoju.weebly.com/uploads/1/3/0/8/130814030/6894718.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/gezid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pudamalulera.pbworks.com/f/nuxamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/573def97-22bf-4736-a4cc-32be9bcb1237/acting_for_animators_4th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e669d65b-c8a6-4f29-a026-e1f59da300b3/how_to_set_di2_front_derailleur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84855b60-55e8-4ace-ad47-bd22cd6ff02d/there_will_come_soft_rains_poem_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f842da83-c4ad-4026-ab11-876655dc5cd9/zozupofamivikosam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25bfc1b-398a-4c9d-af83-a11e780d15e9/onkyo_receiver_protection_mode.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/jedobudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57881939-88e8-40b3-9b3e-3bd575844da8/50651383852.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/bally_5000_plus_slot_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c4818cb-f53f-4669-a2e2-ed2071799a87/exploring_strategy_11th_edition_free_download.pdfIn PDF document text
    • http://sulegiwi.pbworks.com/f/duties_and_responsibilities_of_store_keeper_in_hotel.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_off0000ce16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE16 3436 bytes
SHA-256: b3fff5891506e5299c239d214f567b2f3788ce2b3301480525d828a1e9eb8332
font_01_sfnt_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 5060 bytes
SHA-256: cf32488793e39f40a53664e86cb8d3389aea75ce2263aa92f7b36696ad43442f
font_02_sfnt_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 11928 bytes
SHA-256: c1812df4100e49a5ed7650e3710fd2af0c1695426ae41351e040c0ac00db5f17