Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cca84ff1e63898…

MALICIOUS

PDF

78.5 KB Created: 2021-03-31 02:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 22db74dbf048f765455500f2c26dcfdc SHA-1: c03465e65024fceb705054f391e9d289bc779ee3 SHA-256: 99cca84ff1e63898cd2e347e0236e72ef68180f2211ac6cc005fc893d0e9c2a3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content.

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://lozipotod.ru/123?utm_term=cheap+cdcr+uniforms PDF link annotation
    • http://reduslim-italia.website/86809965123xjoc2.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/how_to_remove_a_stuck_water_filter_from_a_samsung_refrigeratord85ji.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/zatoxugerudewebimo.pdfIn PDF document text
    • http://misifebofol.mywebcommunity.org/susezemokisinezufiji.pdfIn PDF document text
    • http://mezeferatitora.scienceontheweb.net/14788348094.pdfIn PDF document text
    • http://fullpisetc.ru/how_to_get_cosco_high_chair_cover_off6qkdj.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/13577015967.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/the_lark_jean_anouilh.pdfIn PDF document text
    • http://sayseedokg.com/free_online_multiplayer_survival_games_pc7nfzn.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/whats_the_healthiest_thing_to_eat_at_burger_king.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pafexegud/attu_tamil_full_movie_online.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_1363b9cf4bd54d84bf6dc622b6927c95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwafo/spanish_reflexive_verbs_crossword_puzzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/canada_election_platform_summary_reddit.pdfIn PDF document text
    • http://reladefuxuna.onlinewebshop.net/cateterismo_vesical_de_alivio_e_demora.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_cb12898c2965415b973dd664cf043e7a.pdf?index=trueIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_d1cb61ef4e2c4b16bb8280be87d1ec45.pdf?index=trueIn PDF document text
    • http://wutorokanotomav.onlinewebshop.net/sujet_brevet_2020_histoire.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 5188 bytes
SHA-256: 15233f34043faaaaf3a9db8ab6bf70fbabab2df135e5e93462a1dd1f624b9d9a
font_01_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 10960 bytes
SHA-256: b83bc58f05776484ebd89ac38f911c96eddb5afbd22d01a81d7fc0ec022fec57
font_02_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off00011e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E84 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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