Malicious PDF — malware analysis report

Static analysis result for SHA-256 953c5b6d237a2636…

MALICIOUS

PDF

83.9 KB Created: 2021-03-10 20:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8f94cfe11024328f769238535249733b SHA-1: 6c8cb48e0f1976e7d25c5e098ac850587b59a5e5 SHA-256: 953c5b6d237a26362d4ee10e790a3dbf2adf7ce3bebd41e529a48bc905d264dc
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing attempt. The document contains numerous external URIs, including one pointing to 'zajinet.ru', suggesting it's designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing lure disguised as a game download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/123?utm_term=bike+game+free++for+mobile PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421214/normal_5ffa18c86dd3f.pdfIn PDF document text
    • http://vakekaninu.iblogger.org/bubble_pop_game_app_for_android_phone.pdfIn PDF document text
    • https://xudepafuvinuk.weebly.com/uploads/1/3/0/9/130969511/tumijurosedonajusoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452587/normal_6047ee528dfac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456121/normal_5ff89c0106446.pdfIn PDF document text
    • https://dedemapisiwopiv.weebly.com/uploads/1/3/0/7/130775251/sobefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_6040b220b454b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_6011172a61593.pdfIn PDF document text
    • http://fogozuvonuw.66ghz.com/virigosexiredum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_603bd47c25d4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499995/normal_600c0ee0c42f2.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/98dc0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385863/normal_60316bab1de05.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/definition_of_agroforestry.pdfIn PDF document text
    • https://dupukixulin.weebly.com/uploads/1/3/2/6/132681516/867685.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444649/normal_5fe0d180ba748.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5fe0da766d07f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojunemol.epizy.com/96425194540.pdfIn PDF document text
    • http://malejubu.myartsonline.com/what_happened_at_the_end_of_the_story_the_veldt.pdfIn PDF document text
    • http://fefezaw.rf.gd/what_happened_in_the_us_in_1871.pdfIn PDF document text
    • http://guseboses.atwebpages.com/how_to_build_a_model_truss_bridge.pdfIn PDF document text
    • http://kiwozoma.epizy.com/isometric_sketch_paper_template.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_off00010c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 5164 bytes
SHA-256: 38c8b7d6c51f92b25d35377825ec8ebce1c5d8d46bc0582e6fa60666438fdeac
font_01_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 10672 bytes
SHA-256: fcf7600441156b5b33fc48dfb89de0b608e0aa79b689bff81b0e2f6e27af614b

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