Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12666b8857dc075…

MALICIOUS

PDF

77.8 KB Created: 2021-04-05 22:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a194c7f685f2e5e16314779cdc93f0f0 SHA-1: 830351a70ef98d347036c2e579fb65b92b4e3843 SHA-256: d12666b8857dc0757b2d82743c7115db8bc216b098e87696a1e6fa8e1e8a262b
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to redirect users to potentially harmful content. The presence of a 'download' button lure further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://botokaw.ru/award?keyword=class+11+biology+practical+lab+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412170/normal_5feb07a5771a3.pdfIn PDF document text
    • https://zarixurumis.weebly.com/uploads/1/3/1/4/131406049/1584325.pdfIn PDF document text
    • https://nipotowolexitav.weebly.com/uploads/1/3/4/6/134639117/xojiboxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_603203911640f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_600e995b6e3c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426971/normal_5fda423b487c1.pdfIn PDF document text
    • http://healingtunes.ru/zudidumibekebaferzx0lc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469863/normal_60603841ba808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414164/normal_603ff1470f92b.pdfIn PDF document text
    • https://pudibapajupi.weebly.com/uploads/1/3/3/9/133986481/kibirusetogiguvaj.pdfIn PDF document text
    • http://microdigitalmeter.xyz/joost_mod_legendary_weaponsv9fkn.pdfIn PDF document text
    • http://bilet-pdd.site/bissell_3624_spotclean_professional_carpet_cleaner7yvl1.pdfIn PDF document text
    • http://storeeu.info/examples_of_inferential_questionsdwgkm.pdfIn PDF document text
    • http://physcoo.com/densidad_de_aluminio_en_kg_mm33f4y8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412183/normal_6064d6cc3c9a0.pdfIn PDF document text
    • http://trynon.xyz/7104255887mflkz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_6029789b6bdf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467912/normal_5fe0ffafe80f4.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/8d5066c.pdfIn PDF document text
    • https://xutagevobufoj.weebly.com/uploads/1/3/1/6/131607169/dcdc4e9e1a63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_605504fd2bfb2.pdfIn PDF document text
    • http://glossywp.online/free_download_of_schubert_ave_mariaypzgz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 5676 bytes
SHA-256: 9631537a7d06cf02d4061a085168c5f39a24f4910487481afdc05bf63b892986
font_01_sfnt_off0000fa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA22 2116 bytes
SHA-256: 1f756b46481ac718095810e133e155ec1caf818687d25c20e8b002f727d713c7
font_02_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 10960 bytes
SHA-256: 5c24f0bb9efd04e48182652191fd72a463a246c2367703e4f2137d5c8110fcfb