Malicious PDF — malware analysis report

Static analysis result for SHA-256 6449ad9779dcb412…

MALICIOUS

PDF

79.8 KB Created: 2021-03-18 16:32:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb4be498e5875c98318b677f6a038133 SHA-1: 6da3082a0849936a33107428c79aac248953a978 SHA-256: 6449ad9779dcb41245b09af3414408663691dbf1fa32f6634cc0ec147e764c6e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious or SEO-farmed content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or spam distribution mechanism. The embedded links suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=how+to+make+a+galanz+mini+fridge+colder
    • https://cdn.sqhk.co/fedovusig/jfKiiFZ/assinar_com_certificado_digital_serasa.pdf
    • https://cdn.sqhk.co/nejibija/gjQhijf/neon_genesis_evangelion_youtube_episode_1.pdf
    • https://cdn.sqhk.co/zoxinugokas/shbcAhj/80_90_songs_radio.pdf
    • https://cdn-cms.f-static.net/uploads/4426260/normal_601101e0050f3.pdf
    • http://saxefitipar.iblogger.org/59433742951.pdf
    • https://cdn.sqhk.co/sokulutesi/bhieKb4/pejinepuzutigojolato.pdf
    • https://cdn-cms.f-static.net/uploads/4449774/normal_60302bda6d5da.pdf
    • https://cdn-cms.f-static.net/uploads/4503787/normal_602b7a442262a.pdf
    • https://cdn.sqhk.co/xewiliwilax/ijShchi/peguxuguf.pdf
    • https://cdn.sqhk.co/tibatojo/cjcJURB/vector_robot_anki_price.pdf
    • https://cdn.sqhk.co/wubumeze/jh5Ghem/mermaids_1990_full_movie_123movies.pdf
    • https://cdn.sqhk.co/zurefaxenov/jhgh93f/83313259505.pdf
    • https://cdn.sqhk.co/denirinodo/d1a1bjb/79995962903.pdf
    • https://cdn-cms.f-static.net/uploads/4460057/normal_603c44ab86820.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_ef064ad3b69d4f3899d29f8d4ac2def2.pdf?index=true
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_29de6823f3964105b10723f17ef9fc91.pdf?index=true
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_580266338f9146219fad3b829f285606.pdf?index=true
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_52d422c40d6b40e08e56089109b9bedb.pdf?index=true
    • http://fuwotatikiluwa.epizy.com/telemecanique_altivar_31_manual.pdf
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_232b7c18656f4a7a9ce4fa03f23f282d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5a.bin
5e6c0e61dd1a56badfb4a28921f4858fd63c05355cc61d13c3baf6a9da3b64f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 5116 bytes
font_01_sfnt_off0000fec0.bin
5c05b7b50c30863803eabf962108ecc67aeb332fbdf36c4dddacc5dcf1df9e73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 10840 bytes
font_02_sfnt_off000123d0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123D0 4324 bytes

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