Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bbf46d1fe102c1…

MALICIOUS

PDF

77.1 KB Created: 2021-04-09 13:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 87888c60622ee9b186bdae1d66c1a034 SHA-1: 733ec512a174c7ddf98b3dea880874a7be69a6d7 SHA-256: c3bbf46d1fe102c1caa50380ab686ec118442ab35fb25a3de987d67de62f30c9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. One of the embedded URLs, 'https://nipisod.ru/strik?utm_term=how+to+clean+kenmore+400+washer', appears to be a lure for users searching for specific cleaning instructions, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://nipisod.ru/strik?utm_term=how+to+clean+kenmore+400+washer PDF link annotation
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/a0bcbb0.pdfIn PDF document text
    • https://nufodovepitad.weebly.com/uploads/1/3/4/7/134718778/c95a03052dc.pdfIn PDF document text
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/fudidujide.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/wetikegogibakitamule.pdfIn PDF document text
    • http://seweripuwas.mywebcommunity.org/75780653086.pdfIn PDF document text
    • http://palupalukagu.mygamesonline.org/pokemon_tcg_online_iphone_reddit.pdfIn PDF document text
    • http://xikofav.iblogger.org/nirorokudagexedenosuwulo.pdfIn PDF document text
    • https://vowizata.weebly.com/uploads/1/3/1/8/131856430/nixororasaz.pdfIn PDF document text
    • https://xoxomupufolud.weebly.com/uploads/1/3/0/9/130969418/8f84236.pdfIn PDF document text
    • https://litirovedogamat.weebly.com/uploads/1/3/5/3/135393382/vedepowa-tegoxedilade.pdfIn PDF document text
    • http://wawesoja.sportsontheweb.net/bafomulonokit.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/24820664601.pdfIn PDF document text
    • https://vavuloxen.weebly.com/uploads/1/3/0/7/130738497/magubexup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pijosufun.myartsonline.com/passive_voice_exercises_intermediate.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/lixusobewatu.pdfIn PDF document text
    • http://xidetume.rf.gd/hammersmith_neurological_examination.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/android_bottomsheetbehavior_state.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/best_bitcoin_mining_app_android_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/vocabulary_worksheets_for_grade_6.pdfIn PDF document text
    • http://wupenokisu.epizy.com/tupezep.pdfIn PDF document text
    • http://namezenidel.onlinewebshop.net/types_of_segmentation_in_image_processing.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_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 5384 bytes
SHA-256: 77c621724ea6ccc25fbc76b8997bd1f3e93bb65778a679e80530b17b4ec212be
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 11128 bytes
SHA-256: 0fa5dd50a0dad4119a36c7921b453577e0e05747af5b7844408d696168ad9fb7

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