Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a55a68c0c6c7ff7…

MALICIOUS

PDF

75.8 KB Created: 2021-03-03 06:42:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a505e9ba06323158c2942ea0b7afee0b SHA-1: 978e853b89a33ec8c65abc2e0bb016f59465836a SHA-256: 2a55a68c0c6c7ff728467000324cff887fc1c5c27aa8722a8feb3f48b04d89bd
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this behavior, indicating the document's purpose is to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://fokemale.ru/aws?utm_term=soundpeats+force+bluetooth+headphones+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402262/normal_6013e37d43c54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413235/normal_5fcb9d2f85184.pdfIn PDF document text
    • https://ragixadimeruwu.weebly.com/uploads/1/3/4/8/134897014/4b812ab.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/jcjhihE/u23_rowing_championships_2019_espn.pdfIn PDF document text
    • http://copyright-rules-help.com/tamasha_full_movie_free_mp4ii7dz.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/Aji2he5/merriam-_webster_s_collegiate_dictionary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466370/normal_5fe4424251991.pdfIn PDF document text
    • http://nuverlites.online/drayton_thermostat_user_manualllzvk.pdfIn PDF document text
    • https://ligexuvuzi.weebly.com/uploads/1/3/0/8/130814340/4428371.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/jhmrOjj/dj_player_pro_for_pc.pdfIn PDF document text
    • http://efarbok.xyz/boba_catcher_free_arcade_boba_collecting_game_instructionscwhkv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495841/normal_5fed1bffe1bed.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/vovugakodizodububoipmut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxajofiv.epizy.com/vulijulara.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/bcd_format_converter.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/how_to_use_canon_f_718sga_scientific_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/nba_basketball_game_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/ruluvinedejega.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 5640 bytes
SHA-256: d7bd2154b13bd46048e6007e7c3d80a354c080b0cba4a03e152ef3bc724f37f0
font_01_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 10432 bytes
SHA-256: d577e60d88486f298695c58455d3fd559559ba51418e3e31dbf983e990adc592

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