Malicious PDF — malware analysis report

Static analysis result for SHA-256 4096442547f3f624…

MALICIOUS

PDF

71.7 KB Created: 2021-04-02 19:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 11dd4533b68d42eb65e9d3f9baf57111 SHA-1: 14fec91f8e87e27d0b1d05194341fb27f5f58e79 SHA-256: 4096442547f3f624b4d2ba8f7fb9c31d05f98e9258f7382bdd571e780d15ed24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=ap+human+geography+chapter+2+summary PDF link annotation
    • http://edarudost.online/api_570_study_guideyvyin.pdfIn PDF document text
    • https://vifojozajo.weebly.com/uploads/1/3/1/4/131454549/nexub.pdfIn PDF document text
    • http://vowalokitekile.22web.org/pengertian_cerita_anak.pdfIn PDF document text
    • http://itfamily.info/jigeravemanidumanezodavuh3qx.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/igG8jj5/discount_code_oak_furniture_superstore.pdfIn PDF document text
    • https://cdn.sqhk.co/welosezu/QHicv47/line_dance_blurred_lines_step_sheet.pdfIn PDF document text
    • https://ronisimene.weebly.com/uploads/1/3/4/6/134610282/1844fee48db337.pdfIn PDF document text
    • http://rat-red.space/toefl_preparation_books_2018hxcd5.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/gjtuGKM/piano_man_mamamoo_easy_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/zumiredosuwi/giMWJgj/fipevujoseg.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/53d616ffce.pdfIn PDF document text
    • https://cdn.sqhk.co/sizawoxijosa/e5ih9jc/66772987935.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/petikamov/maremuwoko.pdfIn PDF document text
    • http://virujafaxamer.epizy.com/lezuwobigivopuz.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/48849758727.pdfIn PDF document text
    • http://fojigexojapox.rf.gd/beginner_electronics_projects.pdfIn PDF document text
    • http://gegilifopom.myartsonline.com/project_on_astronomical_telescope_for_class_12th.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/lijipamovibemajegawoditu.pdfIn PDF document text
    • http://gavofime.atwebpages.com/40865589744.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_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 5540 bytes
SHA-256: 9392b0356007bf93b3c346eb57376366302facfc411380aab62d504286b3e307
font_01_sfnt_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 11448 bytes
SHA-256: 16166a98fab2c6aa940ad93ec00777a3198d5938396f6254ebde80df05c0a852

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