Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd5a2f397b9e929…

MALICIOUS

PDF

74.9 KB Created: 2021-02-15 06:03:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5669198da10d9a9747bb1e7304321130 SHA-1: 857a53ac550e869bf8013281840f2844436e208d SHA-256: 4fd5a2f397b9e929de4bd81ba1e7a274b9247d7a0bda7f93aecda49471ad1e3f
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the nature of the links and the heuristic firings suggest a potential for distributing further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/aws?utm_term=cancer+de+garganta+por+vph+pdf PDF link annotation
    • https://reratuzofi.weebly.com/uploads/1/3/5/3/135346135/7193654.pdfIn PDF document text
    • https://cdn.sqhk.co/levuzivanu/noidjcx/dapugosavoted.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/dRihhr7/youtube_free_movies_and_tv_shows_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/H5njbja/iphone_auto_clicker_app_no_jailbreak.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/jdDz4rt/river_cruise_companies_uk.pdfIn PDF document text
    • http://umkatrade.ru/wekobagerugotovijizpm7bo.pdfIn PDF document text
    • http://ourfanz.com/marerapupiruvobopapezeiwfz2.pdfIn PDF document text
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/2047532.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/hgigj0o/wojarija.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/jjPhfTz/kivawafitogewibatenare.pdfIn PDF document text
    • https://jenaniruwisaj.weebly.com/uploads/1/3/4/3/134317053/xixaxidunefob.pdfIn PDF document text
    • http://idclick.cash/words_that_start_with_c_meaning_fun8jr2t.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/9Ajaia2/worm_game_pc_free.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/wibedubosateg/vetafu.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/shopify_edit_blog_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/ocr_additional_maths_2018_examiners_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/dynamics_365_licensing_guide_on_premise.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/buxisilexodusojesaminu.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_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 5172 bytes
SHA-256: dd9bc2d8de84c2d15e419bf7ce4aac6a2a61ceae7ca4ac998fc421f187a06648
font_01_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 10424 bytes
SHA-256: c59a521540f53403a61b1b39d26ba7e4eeebbc8266eb11fef16903e26ff3cfdd

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