Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1e460ad1934e20…

MALICIOUS

PDF

79.8 KB Created: 2021-01-20 20:56:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6f928896e4e29c5b8c8d340e6a98ffa8 SHA-1: 7d2e2d5f23c6524c03d186e699693a3dcb114bbf SHA-256: 3c1e460ad1934e20ae36a84978d5c9ec184d20a8bebbe2cd12a7713f7c2e39b0
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, https://crophysi.ru/123?utm_term=lower+order+questions+in+maths, is the primary indicator of malicious intent. No scripts were extracted, but the presence of a malicious link strongly suggests a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/123?utm_term=lower+order+questions+in+maths In PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/d69a8ddbeaf8ee.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/hdTibhi/vepanubolomuvavujemutib.pdfIn PDF document text
    • https://tuwowezofe.weebly.com/uploads/1/3/0/7/130775341/971987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_5f99092abb693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8cf91250b59.pdfIn PDF document text
    • https://site-1248415.mozfiles.com/files/1248415/different_types_of_brick_bonds.pdfIn PDF document text
    • https://site-1176797.mozfiles.com/files/1176797/naxabolane.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/ihijMhd/supreme_sling_bag_ss18.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/gWjbGNX/drill_master_rotary_tool_kit_for_nails.pdfIn PDF document text
    • https://xibabajawaxas.weebly.com/uploads/1/3/1/3/131398380/bizoxezaje-gagixelisaseko-biseraki.pdfIn PDF document text
    • https://site-1180978.mozfiles.com/files/1180978/tiny_bubbles_in_my_wine_cadence.pdfIn PDF document text
    • https://kezidixujaroko.weebly.com/uploads/1/3/4/0/134040737/tikeboledupeje_birawulodi.pdfIn PDF document text
    • https://site-1196306.mozfiles.com/files/1196306/coin_collecting_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/FdjbMWP/murder_hornet_nest_found_washington_state.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469824/normal_5fc51e5c9056f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/28894488188.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/amendments_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/atualizar_android_samsung_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/76388759300.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_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 5192 bytes
SHA-256: f4a36175d7596debb09bc073455d5d927686aecc4e78a16e40b73c5740841c17
font_01_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 10936 bytes
SHA-256: 5894b5f73382b000cace93c00e661251321f64507a7d5ba047ec24d0b6c5570d

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