Malicious PDF — malware analysis report

Static analysis result for SHA-256 a008fc5d799530a2…

MALICIOUS

PDF

93.9 KB Created: 2021-04-23 13:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 56f3d2ad7d44a8b78e4e53021abc4b31 SHA-1: 269a5459ad0f3a534271ed13feafaa7266df10bd SHA-256: a008fc5d799530a2b7698cca9efbf46b4e956583088e0ae877cc3c297a2b2488
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://golowaki.ru/strik?utm_term=dante+the+inferno+canto+3+summary PDF link annotation
    • http://pivowave.iblogger.org/agnes_grey_anne_bronte.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_600f21dcdf029.pdfIn PDF document text
    • http://mediaverifiedbadge.com/native_american_zodiac_signs_and_their_meaningck2db.pdfIn PDF document text
    • http://myfirstsite.xyz/callaway_mavrik_standard_driver_reviewzsjyr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470207/normal_5fdf12ff1d88e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_6054b07485911.pdfIn PDF document text
    • http://mantenancie.com/tugokevepaxifidumewetg835q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_601406f6886ea.pdfIn PDF document text
    • http://kersita.fun/matilda_movie_download_mp4qb35g.pdfIn PDF document text
    • http://idealica-co.site/chick_fil_a_honey_roasted_bbq_sauce_buyx4w26.pdfIn PDF document text
    • http://ulekschool.online/ansi_codesbm6be.pdfIn PDF document text
    • http://e-devletodeme.net/areas_del_departamento_de_alimentos_y_bebidas_de_un_hoteloeekr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_602c324d946eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/simplifying_linear_expressions_worksheet_answers.pdfIn PDF document text
    • http://fozusiraviwip.epizy.com/watibulunemo.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/what_are_the_seven_basic_plots.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/76064660578.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/90128807694.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_off00012cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB6 5352 bytes
SHA-256: 6024bbe0181c4714c99c9fcee542c497993d4a0bac78ce802501a0b9b080df13
font_01_sfnt_off00013ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED2 13944 bytes
SHA-256: 29ff26177f058d49261a876a409d580bc0d1c0a5d3a4b13e4e00246f50a3ced6

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