Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b892d5fd25c2d9…

MALICIOUS

PDF

79.6 KB Created: 2021-02-22 09:59:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0e75215895f470d4d9eaa3b3aff1eb95 SHA-1: c96ef601085afa6c70cc0cfd88a8402e74ffadb2 SHA-256: 04b892d5fd25c2d903750b98b3da8eb45ec211c684fb1363ccba0d9f265af80b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://leonvi.ru/123?utm_term=sharing+a+web+page+on+facebook PDF link annotation
    • http://cenderaoriginator.com/halo_mythos_bookrnzva.pdfIn PDF document text
    • http://vereffka.xyz/coloring_book_images_of_unicornso1jyj.pdfIn PDF document text
    • http://odemebayisitrafik.com/marathi_movies_sites_2018_freeucbdz.pdfIn PDF document text
    • http://pannochki-art.com/dell_optiplex_790_motherboard_bios_update8gq03.pdfIn PDF document text
    • http://scarcebook.com/loxibezanubaxazajusokukbgse5.pdfIn PDF document text
    • http://1cats.space/buvenutudixotebzaou.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/valikuwurufemopa.pdfIn PDF document text
    • http://immorta-cross1.club/64236017296u03zu.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/a74b2e0f0.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/eigchcI/free_download_lagu_wrecking_ball_miley_cyrus.pdfIn PDF document text
    • http://kayikciakademi.com/61016499482i4wsf.pdfIn PDF document text
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/vejefegep_jogeb_buperivovoj_vixibusanefug.pdfIn PDF document text
    • https://nugakowizadofo.weebly.com/uploads/1/3/0/7/130738823/moredanerilotisugog.pdfIn PDF document text
    • http://medway24.com/31743793874id9f5.pdfIn PDF document text
    • http://alfa-quest.ru/which_brand_is_better_in_washing_machine1b5os.pdfIn PDF document text
    • http://toppiksnack.xyz/xozefigexokm32t.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/management_of_malaria_in_pregnancyjxxsb.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/ahcjaMD/46276131308.pdfIn PDF document text
    • http://sosed.market/scert_books_ap9io55.pdfIn PDF document text
    • http://yogait.space/foragidelebuzudak4l8jv.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
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 5172 bytes
SHA-256: 2cd3da8e4604ea21e11d97117f86518b2e85573e37c2340e33a0063713a0715f
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000fb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 11720 bytes
SHA-256: 2b4f6ab874889c39190d32000130bce40c0000cc27a486b39b63a914fa28b4d5
font_03_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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