Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcfa198e43cc10c…

MALICIOUS

PDF

79.5 KB Created: 2021-04-09 22:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3cac68f79cb59dc0677141cf0ab0986e SHA-1: 1a3171078a55d4f6744d446f21fcc6eee26dcf05 SHA-256: 5bcfa198e43cc10c1a152cad0e28fb0c0f0a4d22751e2a40897cca1e2b330f69
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=sonic+menu+prices+wichita+ks PDF link annotation
    • https://cdn.sqhk.co/zuvifilezaja/chgiiYS/rekuki.pdfIn PDF document text
    • http://xujakebetutusu.22web.org/fusionner_2_en_1_gratuitement.pdfIn PDF document text
    • http://ing-cliente.com/chandamama_kathalu_books_in_telugu_onlineoz326.pdfIn PDF document text
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/cebb7.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/judenikukug-natitudewami-nurugapixi.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/canvas_projeto.pdfIn PDF document text
    • http://rekugegik.scienceontheweb.net/chemdraw_tutorial.pdfIn PDF document text
    • https://bezesigut.weebly.com/uploads/1/3/2/6/132681157/79d43c9264ff.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/hjhghei/41299651035.pdfIn PDF document text
    • http://dizotegi.iblogger.org/38463878592.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/GUuibha/funny_shayari_status_for_whatsapp_in_urdu.pdfIn PDF document text
    • http://rating-bookmaker.ru/how_much_does_a_motherboard_cost_uk2rkan.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/zumirubujobuvikipi.pdfIn PDF document text
    • https://wuvenenuw.weebly.com/uploads/1/3/1/3/131383928/5156695.pdfIn PDF document text
    • http://mufawajidoxe.22web.org/64190331403.pdfIn PDF document text
    • https://tekagegi.weebly.com/uploads/1/3/2/7/132740997/voluwizodafep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_86b94b2379164cbd87a4a58ee0cb1ffb.pdf?index=trueIn PDF document text
    • https://38c64f87-0506-4925-a3a1-425743e24937.filesusr.com/ugd/386d45_6aa8f970761d481c9682d2ff839bc918.pdf?index=trueIn PDF document text
    • http://zimufoduso.rf.gd/xomafololesavuwogo.pdfIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_485d1e22109c4fe0b7e64fb56eba5158.pdf?index=trueIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_6f6e15205cdc441994b19acc90ee4617.pdf?index=trueIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_39cc8492136e4f53bea8954d64b54b97.pdf?index=trueIn 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_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 5400 bytes
SHA-256: 0bb1aee2d8feb080ad2cf24d6ec0dd20c61172ccede530348cd9f1d2599fa7cc
font_01_sfnt_off00010660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 11940 bytes
SHA-256: 4d711b473b72736fcd7cbea085618f3aae2407017315bf5fb7939e74ef134e1d