Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8a3fdbb8bcf279…

MALICIOUS

PDF

80.6 KB Created: 2021-03-26 08:04:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d833a0516ba7a245e03dcf8792cb6367 SHA-1: bc06d2427df16fcf3c46c3fa5130840b503d5064 SHA-256: ca8a3fdbb8bcf279bcf3d07dc6d79cddc8b11d4ecfd8a1ea34401551993aac9b
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are obfuscated or lead to potentially malicious domains, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://vilenefex.ru/strik?utm_term=wills+eye+locations+near+me, which is presented in the document body as a search result. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=wills+eye+locations+near+me
    • https://cdn.sqhk.co/kajipazuto/jhbGieE/traffic_racing_car_3d_game_download.pdf
    • https://static.s123-cdn-static.com/uploads/4481417/normal_5ff767c13e7cf.pdf
    • https://pozagawev.weebly.com/uploads/1/3/4/5/134580069/6e75ae86ba60db9.pdf
    • https://kapizufon.weebly.com/uploads/1/3/4/4/134486886/bojoveliduwa.pdf
    • https://rapofureduf.weebly.com/uploads/1/3/1/1/131164295/kofuzisalififux-nofuwagidoxuje-detazune-suner.pdf
    • https://static.s123-cdn-static.com/uploads/4486042/normal_6007fc0f110b2.pdf
    • https://cdn.sqhk.co/molodomo/jiaifmz/best_free_shoot_em_up_games_for_android.pdf
    • https://zegikawa.weebly.com/uploads/1/3/4/6/134640481/jebimamupixenu-xanen-veminiwa-lujor.pdf
    • https://cdn.sqhk.co/mulepava/jgiCiaE/pathogenic_meaning_in_english.pdf
    • https://cdn-cms.f-static.net/uploads/4461746/normal_601512c6940c0.pdf
    • https://cdn.sqhk.co/wemegofuk/c1zihjd/legendary_weapons_guild_wars_2.pdf
    • https://static.s123-cdn-static.com/uploads/4421627/normal_5ffcaa78944f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_28ab3ae71c9c42b993919917ec07e49c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ede0b1a7-87ff-4b78-ae5d-d6b7aa36db41/solving_rational_inequalities_worksheet_doc.pdf
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_600f4790995f4a9cbfcffc12e5123c29.pdf?index=true
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_fd61f942be554d0494e5d7c0cf14a964.pdf?index=true
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_31762f142fc240ea8351df1a8773e399.pdf?index=true
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_106559f1e589481c991b597d5e68318f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ed3cc1a1-dbc4-4ef4-93ca-a3b67dae3470/tuvapijararodimavujovi.pdf
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_c0e3fde11c7c4eada706e78ab1de7a6b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe06.bin
a602b1f42a6c2df55afb29dc5b851260ec6ccc7c8115500b8bb409b8890f3be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 5060 bytes
font_01_sfnt_off00010f39.bin
7e9f1a4bfacceb8c02d7dcc6158798573c48792e43d0f91ca747299ddb816501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 11308 bytes

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