Malicious PDF — malware analysis report

Static analysis result for SHA-256 c425102477675c9c…

MALICIOUS

PDF

75.5 KB Created: 2021-03-24 01:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 711a029941beeceac5048d44f101b5b7 SHA-1: bcb101aaed7f6172977a69ade913f898b5f3ee15 SHA-256: c425102477675c9c3bb9883fc4fa08230562484f573ae3bf505bb75d88f33055
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as https://zajinet.ru/strik?utm_term=traductor+de+ingles+espa%25C3%25B1ol+con+pronunciacion, likely serve as the initial point of contact for the attack, potentially leading to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=traductor+de+ingles+espa%25C3%25B1ol+con+pronunciacion
    • https://benixufo.weebly.com/uploads/1/3/4/6/134660079/770229db9e.pdf
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/1a671.pdf
    • https://povijovo.weebly.com/uploads/1/3/4/4/134463476/fb7765a589b.pdf
    • http://soldatskaya6.ru/tabesuxuzelada9uubz.pdf
    • http://montana-media.com/wunatoveeko2t.pdf
    • http://ecosbor.net/football_manager_mobile_2020_cheap_playerspvrnk.pdf
    • https://migirebunimalab.weebly.com/uploads/1/3/1/3/131383914/2998596.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/52c5d93b-39f2-4715-92c0-e0ac5f501d6e/applescript_do_shell_script_multiple_lines.pdf
    • https://uploads.strikinglycdn.com/files/a4366697-d605-49ff-a2c8-d3a16dc2aa9f/how_to_improve_written_communication_skills_in_the_workplace.pdf
    • https://uploads.strikinglycdn.com/files/c7f0581a-df2e-4487-8343-ac5829b04437/xowinopowete.pdf
    • https://uploads.strikinglycdn.com/files/c50512b6-e143-4f9b-b57c-d840a16c721e/xawexarotuk.pdf
    • https://uploads.strikinglycdn.com/files/d81fde32-2cc5-4ae1-a556-ec71be13dbab/u_satyanarayana_biochemistry_book_free_download.pdf
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_219fb0541e5c452d910c2b28457d48db.pdf?index=true
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_f273dd68fb334810b81716e599c1ffa3.pdf?index=true
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_9a38f388137c48c9a782ee3905c00fd6.pdf?index=true
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_cd55e573614b42ff996091ef640d281d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/de20b659-27a0-4c1c-bb10-fb7c2582662f/que_es_composicion_en_dibujo_artistico.pdf
    • https://uploads.strikinglycdn.com/files/179427a7-a407-4e60-810d-f2dc037444b2/35688527011.pdf
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_c980336fe1a14bd399fe9af11f9686fd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8f5a780f-b3c7-4ad9-a447-19cc2e58ccc6/lasawoliwar.pdf
    • https://uploads.strikinglycdn.com/files/e7801bf2-3656-4afd-aa12-86fee13dc409/64274131741.pdf
    • https://uploads.strikinglycdn.com/files/5e8e77fc-c582-4a5a-9e74-09fba45bdb1b/81290229356.pdf
    • https://uploads.strikinglycdn.com/files/93cb8db0-cff1-41f8-91c5-167e776f2c37/the_human_body_an_orientation_notes.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_off0000e638.bin
caaa71758255b893ae725993cff4293ebaaff807b4dc94048124981d80ec373b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 5400 bytes
font_01_sfnt_off0000f867.bin
8dd361f846278b2a6b1bde54b6b6d0cba5fa60873560e89b655b5c47e14bc154		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 11548 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.