Malicious PDF — malware analysis report

Static analysis result for SHA-256 453b76adcd42c25a…

MALICIOUS

PDF

87.6 KB Created: 2021-02-20 11:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ed21fabd82dff1fab51eaa8788c89ba3 SHA-1: b49953c633789ba44e96172e35d25670c0736a6e SHA-256: 453b76adcd42c25ab19466a04d9a2d509de7ea7630dfafe7a275ddf85be264e9
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to external websites, with one specifically mentioning 'sniper on the eastern front pdf download' and another being a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=sniper+on+the+eastern+front+pdf+download PDF link annotation
    • http://nusururak.22web.org/create_word_document_from_template_sharepoint.pdfIn PDF document text
    • https://kiseridebajesa.weebly.com/uploads/1/3/1/4/131408791/faliwixevegeg_kixetob_sapisuni_gutebiboruz.pdfIn PDF document text
    • http://leree4.club/wonderful_things_you_will_bep9x13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5fc5757104ae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402488/normal_601a621471e4a.pdfIn PDF document text
    • http://jegexovavof.iblogger.org/bollywood_action_movie_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_601caf2cb0490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_5fda494ab2555.pdfIn PDF document text
    • http://vajogeboru.iblogger.org/mthodes_d_analyses_biochimiques.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kifilexaxinazer.epizy.com/can_i_download_minecraft_windows_10_for_free.pdfIn PDF document text
    • http://kiburomuwilun.epizy.com/the_watsons_go_to_birmingham__1963_grade_level.pdfIn PDF document text
    • http://vigogogakuza.epizy.com/dell_xps_8300_compatible_graphics_cards_2018.pdfIn PDF document text
    • http://wijabotivov.epizy.com/american_journey_landmark_dog_food_review_dry.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/nuwesaxizitadu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 5112 bytes
SHA-256: 0c61a73cba7e69e333a4efbade65df44e6ddf6e69708ef2234e534d15b92ce6b
font_01_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 10720 bytes
SHA-256: 47630ef1b4360f1472fa11a1a6c3ded58be861979dd9b9a874c24a012d8e0540
font_02_sfnt_off00014375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14375 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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