Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4983fd898aa3491…

MALICIOUS

PDF

78.0 KB Created: 2021-03-09 05:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 37f7c3e8ad1c090c4ad6b6afe4f628cb SHA-1: a0bbb7c77803ac59a19ec0b32cecab24137525a5 SHA-256: f4983fd898aa34910147414f3d8252d58ae83eb57f8d5e8edf01e84c77a4e12a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm hosted on disposable domains, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wb?keyword=read%20the%20wheel%20of%20time%20series%20online%20free PDF link annotation
    • https://cdn.sqhk.co/melipetoluf/hfgyJx0/download_game_six_guns_gang_showdown_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/maduzonuxoke/fTphdgd/tropical_forest_match_3_story.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/CXKMXhg/bubble_shooter_fruit_new_friv.pdfIn PDF document text
    • https://cdn.sqhk.co/jegivoziba/hchgja2/smash_bros_melee_gamecube_controls.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/fgighdk/68783541720.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/15322777651.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_13485783e72b4ec8a6e4834e68ec78fb.pdf?index=trueIn PDF document text
    • http://xirexadugimog.atwebpages.com/garmin_920_user_manual.pdfIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_d649e8cbdb944db781c5ee2c79763836.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/building_drawing_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83314956-083b-494f-adc6-1bf1e7c78897/76584905049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37898e05-bb65-4192-a260-7bd6a526960e/70742238841.pdfIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_58b3a71fc88f46fe914359508d56ac8b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/aow_planetfall_syndicate_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72cbe92-3f25-46e9-bfd1-a5954b59e9a1/is_kingdom_manga_over.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91f5302-8cb2-4b58-967c-6176f1c189d8/xerox_workcentre_3325_driver_windows_7_download.pdfIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_357628bcd6794db98c6ee38ef010d251.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/zekuxusiji.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/warinerukafazat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34988a69-243c-4721-b997-4abdee41a3ee/19230570353.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_30b5ed9f0e8f49c790dfcd5272b9408a.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_f32d9dd6a99c42739013ff74cc4c343d.pdf?index=trueIn 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_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 5244 bytes
SHA-256: 5def788c40d0bed7e2747b500d48c32018f04a837a065e42245f022967908dd8
font_01_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 12056 bytes
SHA-256: 635766168d405d8f8fb588d2904c891e5e72d4e1bbb037793ad038f278f64b20