Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6c84aa321950bc…

MALICIOUS

PDF

71.3 KB Created: 2021-02-16 07:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6e4750d29ea8be74fe59e2f1e51af05f SHA-1: 7e18fa6086d8409ed28865713c755501b4868b45 SHA-256: 1b6c84aa321950bc64f1cb0061791179c03f78df4716fd5b605cf2a91e5197b0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a large link farm. The document body, though heavily obfuscated, suggests a lure related to product keys, and the presence of multiple external URLs indicates an attempt to redirect the user. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=enter+your+product+key+microsoft+excel+2013+without PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479212/normal_5ff88cf220b7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475572/normal_5ff654000e6dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392877/normal_5fe26d0dc68be.pdfIn PDF document text
    • http://tajumizigareni.iblogger.org/kuzuneneguniloba.pdfIn PDF document text
    • https://cdn.sqhk.co/fonixoligem/ibhbIOU/cut_the_cake_drill_rowing.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/BYjcApb/brasfoot_2020_premium_apk_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475580/normal_5fdbda6ccc230.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimoxifagi/egf6ii4/money_plant_feng_shui.pdfIn PDF document text
    • http://tuwatisu.22web.org/kovaxabizajemogus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_602aeffc6a9d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366050/normal_5feafeee8d09d.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/GjdEjbD/gisefapug.pdfIn PDF document text
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/sewumazufenusenuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368496/normal_6015b42f7e21e.pdfIn PDF document text
    • http://fisidunetozusi.iblogger.org/business_english_elementary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393639/normal_5fcd3e8e95716.pdfIn PDF document text
    • https://vilofezilo.weebly.com/uploads/1/3/0/7/130740065/nemipiz_wazawowadew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450424/normal_5fcc5ac46793d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luvojidepezepag.epizy.com/bodyguard_2_pakistani_full_movie_free.pdfIn PDF document text
    • http://nanesipub.rf.gd/tisiwunafemi.pdfIn PDF document text
    • http://mamisiz.rf.gd/gamukimajoferanifala.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_off0000dba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 5956 bytes
SHA-256: 3baa0a33597f46d799a8cb50b55055ee73c2a190c62d6eedf371d010b8e1b3da
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 9168 bytes
SHA-256: b21e97488eeeeb870f7b8eb0c60aecdbffe14b5626c6ff737ecfd7820c7824ec

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