Malicious PDF — malware analysis report

Static analysis result for SHA-256 133f39850e74d6dc…

MALICIOUS

PDF

92.9 KB Created: 2021-04-02 23:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ed533e81d88daf09fae5288372037e76 SHA-1: f56be52846000daeb39b4e1cf05d252eb3675897 SHA-256: 133f39850e74d6dc71d72f983ba905d27138fcb84db6637ce18d33ebc7a5e6fb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a link farm with numerous external URLs, including one that appears to be a lure for "what is a fixed charge penalty notice". The document's structure and content suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://soxebez.ru/wix?keyword=what+is+a+fixed+charge+penalty+notice PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465397/normal_604d82c13fb77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_604fd3481d8c5.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412774/normal_5fe39ecde6045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_605910f5c4aec.pdfIn PDF document text
    • http://torchqbfl.fun/how_many_ww_points_is_a_premier_protein_shakeindqi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470685/normal_600101a6c6cac.pdfIn PDF document text
    • http://afracheat4.xyz/duduvizuvukemejobemjx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457849/normal_5fcb63718ee48.pdfIn PDF document text
    • http://topcreditscore.info/wildgame_innovations_insite_cell_trail_camerap1wj5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_600b35fec1c8a.pdfIn PDF document text
    • http://lifeshop.pro/gcse_chemistry_balancing_equations_questions_and_answers7lqi0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_60542016d5d14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_5fd1cad62fa21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gesaneju.rf.gd/annex_17_10th_edition.pdfIn PDF document text
    • https://ebd157e6-94c3-4ff5-b3ab-516f87acbde6.filesusr.com/ugd/e87473_291c00573b7e4704bca298d06ac7227e.pdf?index=trueIn PDF document text
    • http://jevejizodirosaw.epizy.com/rekorotomu.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_2db53ff286784c729aa9006a781b203e.pdf?index=trueIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_54d4e5b082bb4eb1a343633dd06ca67d.pdf?index=trueIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_53230726d7dc452aad2d4d9c7f95d87e.pdf?index=trueIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_ffbd5ff8338c45c28ab0e5bb5afd524d.pdf?index=trueIn PDF document text
    • http://zavonatirudim.epizy.com/70882993546.pdfIn PDF document text
    • http://tofegegumenoz.rf.gd/what_are_the_different_software_development_methodologies.pdfIn PDF document text
    • http://fobeguwimot.rf.gd/56223187566.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_9eb292099c034e529db7778e677ddce9.pdf?index=trueIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_7a2605cfd7164c7192c5dc8f5c31e78f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 5388 bytes
SHA-256: 908d8a8f3735e73a7795c2b798245e1df991acaa49fc1b3ebc3e3a65e3240805
font_01_sfnt_off00012e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7B 12280 bytes
SHA-256: 0083af0f17c17905cf38f18e620ba031ad4090a4ead6b23025c888e6cf4b5f5f
font_02_sfnt_off000157c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333