Malicious PDF — malware analysis report

Static analysis result for SHA-256 0178302eb7ab8969…

MALICIOUS

PDF

77.6 KB Created: 2021-04-09 20:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c03b52f8ba738028ab7c0f07c4feb5fe SHA-1: 23545cad025a4af121c77438dec00d5ce1d52e24 SHA-256: 0178302eb7ab8969168404be34a764df1f09c9c7932eac646570fc21622a4e22
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are on disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'Applied numerical methods using matlab'. The presence of external URIs and the link farm heuristic indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=applied+numerical+methods+using+matlab+pdf PDF link annotation
    • http://vinnipoh.space/honda_generator_eu2200i_vs_eu2200i_companionyhyd7.pdfIn PDF document text
    • http://antonioit.fun/50_shades_of_grey_book_chapter_1yr1do.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/gafinitaplsl53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458856/normal_605c0827c1683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390664/normal_6062d73f625fb.pdfIn PDF document text
    • http://netzamka.ru/new_mombasa_policel5k9i.pdfIn PDF document text
    • http://kalavar.xyz/91447123820v64xe.pdfIn PDF document text
    • https://pujowelitolav.weebly.com/uploads/1/3/1/4/131438356/nosefirizov.pdfIn PDF document text
    • http://antonioita.fun/59931549482t1spz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366005/normal_5ff67d10973ae.pdfIn PDF document text
    • http://termo-nord.tech/10741297990q5yr6.pdfIn PDF document text
    • http://mebel-albero.ru/catering_company_profile_templatez8llh.pdfIn PDF document text
    • https://lokuzovitopoz.weebly.com/uploads/1/3/4/8/134871506/843cf244c00855.pdfIn PDF document text
    • https://zigetavut.weebly.com/uploads/1/3/0/8/130814179/vurud-bisixerilaletik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378393/normal_5fed944187ec3.pdfIn PDF document text
    • http://qwertyujg.xyz/52666764052scwuc.pdfIn PDF document text
    • https://rebomavarel.weebly.com/uploads/1/3/4/8/134883959/vaxewobinage.pdfIn PDF document text
    • https://botiwugagow.weebly.com/uploads/1/3/1/8/131872238/werurur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419642/normal_6063f41b3dea3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca11aeb7-9826-4987-95d3-1536b0c3127c/are_maytag_washers_reliable.pdfIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_1f1c2b354c414d9e81b9360d546142af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40407d09-3a8a-43ef-a6cf-05223c610e39/tipo_de_sistema_operativo_mvil.pdfIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_9e5546567f174058a94c8297a66f62da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd825efe-0c4a-42b2-ace9-edeb59cd282f/tofewuvajeviw.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_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 5700 bytes
SHA-256: cafb762644235512ead7b4c668a34d087d9cca63a64d84a0f0087e5352d6f447
font_01_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 11188 bytes
SHA-256: 26ec398811608bc71c08d48a087e9bf05faf745b2f007fe8d29d3ed41c4896cf

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