Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6410c5a270fc350…

MALICIOUS

PDF

78.4 KB Created: 2021-05-14 04:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 848d2c28e118c601871e47fd0b4f2c65 SHA-1: 5944bb67613c0ac9288271f7c11c705e56cd22e4 SHA-256: f6410c5a270fc35008c5b6e95e1b9fe02fc426c6d8fe037cce0644b6754b0d3c
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing document and a link farm hosted on disposable domains. The embedded URL, 'https://maypoin.ru/strik?utm_term=how+to+clean+your+keurig+filter', is likely the primary malicious destination. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest an attempt to exploit vulnerabilities or trick the user into visiting a malicious site, consistent with spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://maypoin.ru/strik?utm_term=how+to+clean+your+keurig+filter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369626/normal_6031127ec5488.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/hegia7u/game_dev_story_2_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/vnZgi84/62158483552.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/5oDiaAE/zanuzax.pdfIn PDF document text
    • https://cdn.sqhk.co/rilixuzewiv/XuKpGP6/7233104352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_60527016c1374.pdfIn PDF document text
    • http://xusetifawog.mypressonline.com/mathematics_formula_ebook_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/iilnVgg/logo_quiz_2020_answers_level_4.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/radiation_heat_transfer_examples.pdfIn PDF document text
    • http://nifimoperokoj.medianewsonline.com/xiropukakux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378390/normal_5fca6c43e14bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_3240e8199fb9430fba3339cca8f4d3df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nawuvud/97027434399.pdfIn PDF document text
    • http://kubapesopujix.rf.gd/searchs_for_words.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/reported_speech_sentences_exercise.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/zujogutiguxuvetovozivo.pdfIn PDF document text
    • http://zirivog.rf.gd/blacksmithing_basics_for_the_homestead.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/unacceptable_meme_template.pdfIn PDF document text
    • https://7b8833d7-014c-4875-9c37-56438ffeb98a.filesusr.com/ugd/ccf209_9124f8f17c66473886f61f734747d63a.pdf?index=trueIn PDF document text
    • http://moxixezegosa.onlinewebshop.net/16840186993.pdfIn PDF document text
    • http://jidodurej.epizy.com/imagenes_de_caras_felices_tristes_y_enojadas_para_colorear.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/65982092935.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_3ddd318ee0f6411baf065373c2aa5c14.pdf?index=trueIn PDF document text
    • http://vigujabufovejo.rf.gd/what_are_7_continents_and_5_oceans.pdfIn PDF document text
    • http://zegeridibedile.rf.gd/aneurisma_significado.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_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 5088 bytes
SHA-256: cd862648ed38f148f0cffa3e8d46ae34619bcb54b9ca550b56dbcc63902e8ed9
font_01_sfnt_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 10632 bytes
SHA-256: 2625403e9d56f75f57b58d9644358d1b68ddc10454ccf52384212b8e4513cb25