Malicious PDF — malware analysis report

Static analysis result for SHA-256 8664ca9e2c742af8…

MALICIOUS

PDF

78.9 KB Created: 2021-03-12 20:23:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fde2e0c4f4303bc84d99b63b6850342d SHA-1: 15d761760fa9464943b08c55c2ecda8983405b6d SHA-256: 8664ca9e2c742af82ab2d610115c6d8beeef1e8879f379435b1bf6d28768324d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which are to SEO-optimized PDF files, suggesting a link farm designed to distribute malicious content or lead users to phishing sites. The embedded URLs and the document's structure strongly suggest an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/award?keyword=algorithmic+problem+solving+backhouse+pdf
    • http://50offit.pro/18942697072vhb7s.pdf
    • http://verifedform.com/ducks_for_sale_in_ga8nqdz.pdf
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/navamag.pdf
    • http://matcobzor.ru/are_fba_courses_worth_itut3cu.pdf
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/jifivugepa-rixinoniva-bafadefu-jixovavevijuko.pdf
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/f123a50af17.pdf
    • https://nanexore.weebly.com/uploads/1/3/5/3/135351495/4c8b1b0dfd38a.pdf
    • http://wevutibena.22web.org/how_do_i_reset_my_skyworth_remote.pdf
    • http://puloxev.iblogger.org/1951696565.pdf
    • http://lalashoppen.online/the_monkees_i__m_a_believer_ukulele_chords4j9r3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nukuluduresuju.rf.gd/which_course_is_best_for_ethical_hacking.pdf
    • https://uploads.strikinglycdn.com/files/7a5ca525-0eaf-410c-8d52-7a2f6ccd81df/what_is_sociological_theory_definition.pdf
    • https://uploads.strikinglycdn.com/files/2bb2f2ad-5284-4ee2-9940-5d18b081f919/67955049606.pdf
    • http://saziwujezad.epizy.com/437_a_bail_bond_format.pdf
    • https://uploads.strikinglycdn.com/files/40548b96-c141-4452-b98f-29ca071ea468/how_to_check_cuisinart_warranty.pdf
    • http://jowosidinaruxu.rf.gd/tenergy_charger_manual.pdf
    • http://lapakak.rf.gd/championship_manager_2018_free.pdf
    • https://uploads.strikinglycdn.com/files/aa189a11-3dd4-472a-bb95-00d1a514388a/polaris_side_by_side_1000_general.pdf
    • http://difavaxegugadu.epizy.com/hd_screen_recorder.pdf
    • http://ravurewabaku.epizy.com/executive_summary_of_a_business_report_example.pdf
    • http://fepavipa.epizy.com/31374462166.pdf
    • https://uploads.strikinglycdn.com/files/43ebfea6-f0f5-4d1f-b31d-1fc269931a7f/the_highwayman_song_loreena_mckennitt_lyrics.pdf
    • 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_off0000ed6e.bin
bb475b8f2a7d534d9adb7708c9a1682a52bc3259d50d0f811dfbd0bbbdaf188b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 5824 bytes
font_01_sfnt_off0001011d.bin
149fd4551e9d74592b6bc74d1b6c2c295af3e918c4f12ab5b3ed0fa7ebcb2403		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 14660 bytes

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