Malicious PDF — malware analysis report

Static analysis result for SHA-256 85558dae00ea7b6e…

MALICIOUS

PDF

162.5 KB Created: 2021-03-19 10:11:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 051771dde7d3c9dc3af209fd8b40bc03 SHA-1: c915475f719620aad28987eeaa8257bfe2be60b7 SHA-256: 85558dae00ea7b6e58a0ced3fc3fe568cf7e05d31c4b844d80561dff71453ee8
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true malicious intent through numerous redirects and link farms. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=the+ak+47+kalashnikov+series+assault+rifles+pdf PDF link annotation
    • https://gujibukogise.weebly.com/uploads/1/3/1/3/131380045/felujuxixozude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_604af1cc0fca4.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/agamemnon_esquilo.pdfIn PDF document text
    • http://rijoginijamibeg.mypressonline.com/45346675481.pdfIn PDF document text
    • https://kabosasano.weebly.com/uploads/1/3/5/3/135398154/lulukesavewejun-ritew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449424/normal_5fe6d2dce3d5b.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/aYjjIjh/tabletopia_scythe_review.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/hjijghc/glitch_cam_pro_apk_video_editor.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/heji5yF/48788924763.pdfIn PDF document text
    • https://xijegasafofid.weebly.com/uploads/1/3/0/8/130815381/731107.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/rewekunilipeso.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/breaking_into_wall_street_lbo.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/CjbQfY9/top_movies_to_watch_on_netflix_right_now.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471455/normal_5ff4c1368b979.pdfIn PDF document text
    • https://vokaratux.weebly.com/uploads/1/3/5/3/135335958/7499133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_6011ea20d939a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_6025fcf6e1941.pdfIn PDF document text
    • http://tafiwon.mywebcommunity.org/dell_optiplex_390_ram_capacity.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/101b20e7-e1b8-4eff-85e4-f95a012dd585/8488603888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a950f5-fccc-42ad-9c2e-af4b7102b687/what_are_the_requirements_for_fha_streamline_refinance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61224677-4627-4366-927a-d87b36368e31/mejobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/363f1daa-afa8-4d9e-9d2a-c106dddb4282/how_to_remove_aquasource_shower_faucet.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/char_broil_oil_less_fryer_rib_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff29af41-e4e2-4522-bb7a-53519cf56b41/english_to_spanish_translation_past_tense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9813f19-460f-4f20-90f8-79f15e7f0912/63276715492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df4ad5c-c56c-4695-82a6-dc8a573e508b/puxosowawuxadefopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adfb714d-9454-47f6-8f7c-18ee9ff9e353/artillery_shell_casing_identification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4e326e-7940-47d6-896f-2d422a9eada9/rutimasisigeva.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B14 5372 bytes
SHA-256: b6a870047da6c985ad56981c21bbd895f7d41546702abb6ce5b4db2414ec8613
font_01_sfnt_off00022d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D60 19424 bytes
SHA-256: 13ffd7c1238f40f0950cd30bcea52ad2190dcfb99320a927f76ab92a79b8a311
font_02_sfnt_off0002663f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2663F 16060 bytes
SHA-256: 2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357

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