Malicious PDF — malware analysis report

Static analysis result for SHA-256 203172afa2aa8620…

MALICIOUS

PDF

67.4 KB Created: 2021-03-28 07:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: de773ca749306ede6e5f26b6d21bbd5f SHA-1: 358ee2ac5df54c62c00517a2764a4967be482af3 SHA-256: 203172afa2aa8620a6d2585b57d0ba3faef84682f570fac7288f58c06c66fbd7
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

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://pelibifir.ru/wix?keyword=learnenglishfeelgood+travel+english PDF link annotation
    • http://twenty-promo2020.ru/antibiotics_book_freehn0cg.pdfIn PDF document text
    • http://feludekinopotas.scienceontheweb.net/94776853437.pdfIn PDF document text
    • http://murimubijejaba.mygamesonline.org/paleo_diet_food_list_for_beginners.pdfIn PDF document text
    • http://twitter-center.com/43113669722y2jac.pdfIn PDF document text
    • http://fejugutafilevin.scienceontheweb.net/biology_scientific_names.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/22677735412.pdfIn PDF document text
    • http://fusekimutoxi.sportsontheweb.net/youth_mental_health_first_aid.pdfIn PDF document text
    • http://gezetola.scienceontheweb.net/23546074366.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/44473598343.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/xipekizujarezuwubesadumev.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/american_born_chinese_book.pdfIn PDF document text
    • http://mazejofeg.mygamesonline.org/vazukomarazusomex.pdfIn PDF document text
    • http://sabumow.mygamesonline.org/capture_an_entire_web_page_as_an_image_or.pdfIn PDF document text
    • http://bufezipuduxev.mywebcommunity.org/antrenmanlarla_geometri_2_zmleri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://webidiwotew.epizy.com/lips_of_an_angel_meaning_yahoo_answers.pdfIn PDF document text
    • http://jeraferup.epizy.com/dufugogebivalamuruboz.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/zilexadula.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/assigning_oxidation_numbers_practice_worksheet_answer_key.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/pdf_accessibility_checker_pac_3.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_off0000ca1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1B 5168 bytes
SHA-256: 7bf021dc1e22afddedd6563611107094b2c8e5393f13e7fadad96d607672ac53
font_01_sfnt_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 10596 bytes
SHA-256: df2f512c1901cfb29b525ae13522945bac2208f07c0dca18501199633ce81a49

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