Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87ebcecafbc2a2e…

MALICIOUS

PDF

74.0 KB Created: 2021-06-06 20:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a0b237a4ec0d2b027569924f922e3d89 SHA-1: 71660b31615e3f06b56de5c438ec1f9b70a3b4f0 SHA-256: b87ebcecafbc2a2e8b5498a937ac7b409e4b99acf85e4cecd0d71372d5e1d1ef
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://infrive.ru/pbw?utm_term=element+3d+v2+2+license+file+free+download+for+mac PDF link annotation
    • https://jozitosada.weebly.com/uploads/1/3/4/3/134325699/nixob.pdfIn PDF document text
    • https://gugebizibepowe.weebly.com/uploads/1/3/4/3/134364706/664229.pdfIn PDF document text
    • https://biwozatilajatem.weebly.com/uploads/1/3/4/6/134636438/dumige.pdfIn PDF document text
    • https://tosufiriro.weebly.com/uploads/1/3/4/4/134472590/lutuzezazimuwin-bivomo-ruwades-sepowovum.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/xatipenozetozedag.pdfIn PDF document text
    • https://xomiwisaxi.weebly.com/uploads/1/3/3/9/133999446/rebaj-kofuvirame.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/sezevugudodax.pdfIn PDF document text
    • https://kivijakesav.weebly.com/uploads/1/3/2/7/132740669/c170e56.pdfIn PDF document text
    • https://dewazolasimuf.weebly.com/uploads/1/3/1/4/131453174/fefaj_sopovoxofuni_bonaxorovegorof.pdfIn PDF document text
    • https://xuzexutibezime.weebly.com/uploads/1/3/4/9/134904436/6248397.pdfIn PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/jowajimezi-jexobisevukoku-zazezef.pdfIn PDF document text
    • https://rajuvafawomok.weebly.com/uploads/1/3/4/4/134455823/fomegepeg-xabimozozuwamem-tiwirunopomino.pdfIn PDF document text
    • https://tujazemedup.weebly.com/uploads/1/3/4/4/134473975/8868912.pdfIn PDF document text
    • https://xovonanukotu.weebly.com/uploads/1/3/4/8/134898985/nenej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bevojoluvu.pbworks.com/w/file/fetch/144447270/gigipugejilupapu.pdfIn PDF document text
    • http://nidibewuzi.pbworks.com/f/mayabazar_full_movie_hd_download_in_telugu_movierulz.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144595239/merchant_of_venice_act_1_study_questions.pdfIn PDF document text
    • http://tuvovazuvezo.pbworks.com/f/31742204371.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/f/is_afro_samurai_backwards_compatible_on_xbox_one.pdfIn PDF document text
    • http://vananizi.pbworks.com/w/file/fetch/144711633/libro_de_microbiologia_koneman.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/f/runepometemikibalub.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/60815080514.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_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 5572 bytes
SHA-256: f173906a53292a3d4d62c1ea82ceda6ae47fd661f352ad93196f79a487d833bd
font_01_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 11304 bytes
SHA-256: f5d154336d004963755802cda5fd3583cf417bb55315c6738e90c54d54fa3158