Malicious PDF — malware analysis report

Static analysis result for SHA-256 16039b26e7ae3191…

MALICIOUS

PDF

85.4 KB Created: 2021-06-09 12:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 648f292879599806387aeb30303ff130 SHA-1: ca79b42fe0ec5c456087ec97782200939ee78db2 SHA-256: 16039b26e7ae31915433965f5d198448ac8ec5ab4b979e06a5d1e40ab0ffd5e9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. One prominent URL, 'https://chcial.ru/pbw?utm_term=logic+pro+9+free+download+full+version+pc', is presented as a download for software, likely a lure to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://chcial.ru/pbw?utm_term=logic+pro+9+free+download+full+version+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466413/normal_6056ceb2c82ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501233/normal_60293746310a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417648/normal_60000e8891751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_60657163d69a1.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/233b4367b6ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454684/normal_6004d98b84240.pdfIn PDF document text
    • https://wizaxonaguwaxi.weebly.com/uploads/1/3/4/3/134306690/6591512.pdfIn PDF document text
    • https://damasidegiked.weebly.com/uploads/1/3/1/4/131411688/cd6a6c285f7b5a3.pdfIn PDF document text
    • https://xoxomegu.weebly.com/uploads/1/3/4/7/134724284/a2e3f5344ea96.pdfIn PDF document text
    • https://tezefidusipenu.weebly.com/uploads/1/3/1/8/131857758/37d7fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/223c98d3-188e-4902-ac07-c0862208667c/gypsy_jazz_ukulele_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a36c63e5-c9db-44f9-8253-fa814efdd709/massey_ferguson_1650_attachments.pdfIn PDF document text
    • http://kedefoviraj.pbworks.com/f/77317906674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5779be3b-e38e-4e6c-b901-829a1df3fa7c/descargar_diccionario_espaol_ingles_gratis_para_pc.pdfIn PDF document text
    • http://gulisapil.pbworks.com/f/how_to_write_daily_progress_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b15632d-6e9f-4c74-a76b-66f7518a1138/what_does_ctrl_alt_z_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b94f459-9ff7-40db-8b05-e1c6dfaa82a2/minn_kota_talon_8_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ee5c5c-40e6-4af7-a4c7-122a4b8a32e2/what_is_maria_montessori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a528569-5f2a-46d3-ba22-994c6f60079c/vewex.pdfIn PDF document text
    • http://gudikijuruf.pbworks.com/f/nidorubitotigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac241dc1-f231-492d-8af5-ad4becdac92f/goodgame_empire_hack_gameflare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b800057-7222-4da2-bf31-acfff3059185/pexopotiliwoxagin.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/kanovibebijave.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_off00010ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 5572 bytes
SHA-256: d20f43040811386e03c3ff2470403f9cf0c41164c0a4303bd13c2d846649f33c
font_01_sfnt_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 11952 bytes
SHA-256: 2c7c624c2b855b5bde97cae4c06a3fa9050c4a2a62e590d6c8c82292d634faf3