Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f3c6337a810e73…

MALICIOUS

PDF

102.7 KB Created: 2021-05-17 01:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d19656ab92db59f95979fac1d092b8a6 SHA-1: d18f10f7b93db63a11cbeac3d7f97e788e5dc64c SHA-256: 66f3c6337a810e73d1ccd4fb9720fc6bec86056739dac6927ae9eb8407279009
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://botokaw.ru/strik?utm_term=cost+accounting+chapter+5+solutions PDF link annotation
    • http://sweetmeet.online/51595074086v5iil.pdfIn PDF document text
    • https://cdn.sqhk.co/ninilevikod/highgiL/xuwetemevawarurirewexo.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/ih8ibge/7862187174.pdfIn PDF document text
    • https://cdn.sqhk.co/rotazokufaj/zsU4geJ/articulacion_tibioperonea_astragalina.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/fjaibjf/89830756139.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/flJicgI/never_have_i_ever_questions_for_couples_naughty.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/jjKcxFs/whitehat_jr_book_free_trial_class_now.pdfIn PDF document text
    • http://copyright-supporthelp.com/833769511574gpxz.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/dgdhdG7/autocad_blocks_free_cars.pdfIn PDF document text
    • https://cdn.sqhk.co/memenewo/wmuifjg/paruxilasarusuvali.pdfIn PDF document text
    • https://cdn.sqhk.co/dilereku/g8Uhejj/saxafufuxunosax.pdfIn PDF document text
    • http://importants.space/49042320427c7wkz.pdfIn PDF document text
    • http://es50off.pro/acer_aspire_e14_e5-471_specsjpe34.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/37096642126no264.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/uliifia/rivavuturekawojatitimu.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_d36ba0c2cc48496a9acb74304d8b862b.pdf?index=trueIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_ad0d254903154bc0827981cab0e1d0a5.pdf?index=trueIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_8dc69f469a734fd180cc972718182d34.pdf?index=trueIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_446d4cc7e59b465abd9e854cff0a3e25.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_5b1bfbc371e9420c8bb0cc1ad25fef88.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_5760d65fa1bb44c387bcef34a8b1278c.pdf?index=trueIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_3e3ae60e13fe4506b488fe4ef0d6e9b9.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_5c24734bc143499a96c6c8f85ecf82ed.pdf?index=trueIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_bb76d059fdce40a0b5b4cbffa426d0b8.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_3f877bab042d400a9eb6a0ad2d3c19b6.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
    • 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_off0001336b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336B 1596 bytes
SHA-256: 2f40bb06fca9b6afa603075e8860d9ded7d4f8f3812b63d4e0bdd314cca1484b
font_01_sfnt_off00013b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6A 5224 bytes
SHA-256: 68780c595d0db733d6d8276da98287dcefcd52a7648811437f842cdf588432ab
font_02_sfnt_off00014d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2A 12004 bytes
SHA-256: 5fc09a3c90a8df2644ffbd55ccbc4f9d15a8ebc52b94fca2387159df18d191da
font_03_sfnt_off000175f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F2 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d

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