Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44eff34220ab8bd…

MALICIOUS

PDF

66.0 KB Created: 2021-05-31 22:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 85143346b4f43258620dfe0979b725c8 SHA-1: 3164e64bb91546cb1b8feb366e6ad58b3d1d94d4 SHA-256: b44eff34220ab8bd8c9539e6f3ce04e0824e5d4c46a30d023f8482213bbadc8c
186 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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of an external URI pointing to 'ponafet.ru' further supports this, as it is likely used to redirect users to malicious content. No scripts were extracted, but the overall structure and link farm heuristic point towards a phishing or SEO spam attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/123?utm_term=bauman+amor+liquido+pdf+espa%25C3%25B1ol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481667/normal_5fdb5b1d21dd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469617/normal_5fefb37891a53.pdfIn PDF document text
    • https://povozunalurowub.weebly.com/uploads/1/3/4/6/134665666/5419759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_604513a9257a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403283/normal_6009f0b4219ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_5fdb3f82b6b98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_600a13c9e98fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495526/normal_5fe31ec66509a.pdfIn PDF document text
    • https://rejigebejone.weebly.com/uploads/1/3/4/4/134462336/xesupozodigi.pdfIn PDF document text
    • https://fadegedisumobe.weebly.com/uploads/1/3/5/9/135992854/f237b4ad61088f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367627/normal_6036fb55bba76.pdfIn PDF document text
    • https://gexemuxu.weebly.com/uploads/1/3/5/3/135394015/tuvapegol_fuluwanemukawa_zazofimowu.pdfIn PDF document text
    • https://vagajexaxe.weebly.com/uploads/1/3/4/3/134359414/finafaxadif-turozut-fagaxido.pdfIn PDF document text
    • https://zududebagulakes.weebly.com/uploads/1/3/3/9/133997448/pasolebu_ritezerogixidez_balerexoki.pdfIn PDF document text
    • https://zutujoxiker.weebly.com/uploads/1/3/0/7/130776667/bozoso-dafiwugojobomaj.pdfIn PDF document text
    • https://tofikopu.weebly.com/uploads/1/3/1/3/131381225/56d22dbd.pdfIn PDF document text
    • https://vikuxujawud.weebly.com/uploads/1/3/4/5/134515409/tipuvun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413274/spot_report_format_security_guard.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144421113/89766639998.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/beethoven_spring_sonata_violin_sheet_music.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/f/24160781368.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/papelovumaneximog.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144411429/cost_to_polish_an_airstream.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144411396/gexibewuzudofijuxob.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_off0000c428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC428 5576 bytes
SHA-256: 28e4e6284b897a2e13d626d348173c34cfa8c553142ccd601ab4070476b0d5d3
font_01_sfnt_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 9876 bytes
SHA-256: e59ae41fe1134788acf8a0c437e5528d7b18ddc0cfc490fc4b68f24b51d75dba