Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ad899cf1ad040e…

MALICIOUS

PDF

71.8 KB Created: 2021-04-13 08:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 070194101aa6a6fdf31f7db1c8cfe70f SHA-1: d4fc918c1aff966468e7dc7dc94710cf7a415d59 SHA-256: f9ad899cf1ad040e103566464d2769b2038bd8b8c65fbad9b7794b34b55bcf81
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, many of which are obfuscated or lead to potentially malicious content, suggesting a link farm or redirection strategy. The document body, though heavily corrupted, contains text related to 'Fitbit charge hr 2 leather bands best buy', indicating a lure to attract users to click on the embedded malicious links.

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://dafemum.ru/strik?utm_term=fitbit+charge+hr+2+leather+bands+best+buy
    • https://cdn.sqhk.co/kukisigafumi/gdCevjb/danipoda.pdf
    • https://cdn.sqhk.co/nowonipewo/heo2pyc/winter_warlock_magic_corn.pdf
    • http://venira.su/fmea_software_templatexgcoh.pdf
    • https://cdn.sqhk.co/regomesu/ihigRGL/iihf_hockey_world_championship_2019.pdf
    • https://cdn-cms.f-static.net/uploads/4367631/normal_60289dd768bac.pdf
    • https://cdn.sqhk.co/dogutadova/jhVkFif/zusupodujak.pdf
    • http://grantmedica.ru/united_states_international_development_finance_corporation_address5whiu.pdf
    • https://cdn.sqhk.co/pepupiribojo/Wljeghr/din_a4_mae_cm_querformat.pdf
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5fcfe504c4ffa.pdf
    • http://salet.store/jio_video_calling_appsp5pya.pdf
    • https://cdn.sqhk.co/zerurukoraju/8FaauHU/449927200.pdf
    • https://cdn.sqhk.co/pelemobi/aG3jg2h/factoring_trinomials_using_algebra_tiles_worksheet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://115777a2-cc0e-4789-9e99-30cf4bdfca1a.filesusr.com/ugd/2b3546_97685de4b8f74b2abde6036ea524f4dd.pdf?index=true
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_d9544c9c0fce4432a739a4668c34e4ac.pdf?index=true
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_76412c7abf96486e9a014fce668bd9aa.pdf?index=true
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_f9cb7b4f6ced4620a15d8960d6eafb2f.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_off0000d8d9.bin
f1649f533f1ce42c61fe76afdbfdbb973202f3637726f6b3940e40b6f87107d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 5528 bytes
font_01_sfnt_off0000eba1.bin
17cae70db303d1c51dc865ae6f4d875afbd5fdb720d65be7cf79e382694c243f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 11696 bytes

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