Malicious PDF — malware analysis report

Static analysis result for SHA-256 dded10fe466ad418…

MALICIOUS

PDF

72.5 KB Created: 2021-03-08 22:22:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d17119d7bdcaf93713a69b52e17e4d1c SHA-1: 2cd8e75abe216dcba80e4beab56815ace06621b4 SHA-256: dded10fe466ad41831365cc03a79c28c1e1672410896dc8fa9dad3e4953e784a
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 point to SEO-optimized PDF hosting sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document body, despite being heavily obfuscated, suggest an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/award?keyword=stokes+theorem+problems+and+solutions+pdf
    • https://cdn.sqhk.co/dalubevemex/gDdhjcm/zisagunuvepuzekepuf.pdf
    • https://cdn.sqhk.co/depifozopupe/WXIkgD4/pac_radar_iot_platforms_in_europe_2019.pdf
    • https://cdn-cms.f-static.net/uploads/4501374/normal_5fe99cd564d0c.pdf
    • https://cdn.sqhk.co/xuxofidipo/XhgfXhh/muslim_love_couple_images.pdf
    • https://static.s123-cdn-static.com/uploads/4387566/normal_5feb59c126aaf.pdf
    • http://fuwikodafe.iblogger.org/rival_ice_cream_maker_walmart.pdf
    • https://cdn-cms.f-static.net/uploads/4426410/normal_6020f8e267bc9.pdf
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5fd296fbecd2f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_6640c55ae4ab41f6b361d7f8a7035f1d.pdf?index=true
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_bc2c736129014a998efcf2cdec29804c.pdf?index=true
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_9426a90abb864507a8f7c61b6b42f09f.pdf?index=true
    • http://sasitegeke.epizy.com/snap_on_solus_pro_price.pdf
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_7760fcbeadd342069d82695c4bd834f3.pdf?index=true
    • http://fidekoguvibatid.rf.gd/metamorphosis_book_quotes_with_page_numbers.pdf
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_a998c5fac05644b785ac801ba6826189.pdf?index=true
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_5c2dddead21a4f2787657690251aa900.pdf?index=true
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_e7f95b76226149c4a1d2de254b21cd3b.pdf?index=true
    • https://b90a7337-732c-412d-b8e2-2a85b5386414.filesusr.com/ugd/891219_85b021200c8b48759051be53c7c2456e.pdf?index=true
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_342c8f50755b4caf912f0876d513ef50.pdf?index=true
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_62cbbcec19c846a5a28a76c40c82b893.pdf?index=true
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_6c97f75817c048c9a9ea4d156acc9374.pdf?index=true
    • http://pogifovemujure.epizy.com/jotaro_s_theme_sheet_music.pdf
    • 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_off0000dd80.bin
ee01d11314e37873b420b65a987f7c31c60ea5bac642ae76f17e1e268af8259a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 5588 bytes
font_01_sfnt_off0000f047.bin
4e7306a13a8dd1a8f7f688125d25a4491762b8eb9e7b73d1dad14389bb124be0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 10544 bytes

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