Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffb017fe36110d4…

MALICIOUS

PDF

119.0 KB Created: 2021-06-10 18:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e150ebcd42c5e721da78edf9c3077ab3 SHA-1: afcd9ed3e192774d2f40b8407b7083ec49aa8d72 SHA-256: 9ffb017fe36110d497ce874ac9b691d9c95c39cc6898072b0e89b44a4388f52d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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://huntic.ru/pbw?utm_term=bleach+vs+naruto+3.3+mod+all+naruto+chars+2019+download PDF link annotation
    • https://dujejasafat.weebly.com/uploads/1/3/0/7/130739214/rabaxikuvonixas.pdfIn PDF document text
    • https://fobopogukigu.weebly.com/uploads/1/3/4/3/134366855/piguxo_silobojoz_jibuwovufinibeb.pdfIn PDF document text
    • https://gileledera.weebly.com/uploads/1/3/0/8/130874536/sekawexoxaz_vuteberuke_vimizu.pdfIn PDF document text
    • https://julasunanuk.weebly.com/uploads/1/3/4/3/134308365/gujopex-robumimode.pdfIn PDF document text
    • https://manonerotorupu.weebly.com/uploads/1/3/4/6/134683358/3147033.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://debitagemi.pbworks.com/f/xolowoxugezisevowe.pdfIn PDF document text
    • http://fokurid.pbworks.com/w/file/fetch/144683700/kindergarten_worksheets_missing_numbers_1-100.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144673194/kinds_of_adjectives_worksheets_for_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4906bcda-f655-4e6d-89cb-92c236afce77/27615083127.pdfIn PDF document text
    • http://matekid.pbworks.com/f/92482229770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47785140-6277-4b46-aaf2-dc167ae262a1/71734466842.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144451371/sakabakasoxulojegifupel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3716bfec-adc9-4617-9761-714d7c2baf38/cuales_son_las_4_bases_nitrogenadas_del_adn.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/w/file/fetch/145060884/horror_maps_for_mcpe.pdfIn PDF document text
    • http://lakobun.pbworks.com/w/file/fetch/144801798/what_does_it_mean_when_you_have_dark_brown_discharge_before_your_period.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144562398/zorilabawupuwur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f923ad-f0ad-4a76-ae00-f2fd7b0f7c6c/vupizaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e799668d-5e80-4d17-a478-94d0a0383127/73937353420.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/w/file/fetch/144618390/the_binding_of_isaac_afterbirth_plus_all_booster_packs_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/844021dd-c13c-47e4-920e-07d8b33f865b/latedazobenonuromamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e46c6f1-6115-4020-b260-ed2e9e339dc8/how_anti_inflammatory_foods_work.pdfIn PDF document text
    • http://sapixesut.pbworks.com/w/file/fetch/144668517/how_to_build_your_own_reverse_osmosis_system.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144659892/38819759150.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_off0001686d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686D 3080 bytes
SHA-256: a1fd080eb9a80edd8250de87ca0c003daee2fac7587f36c0e7754af12687fd7b
font_01_sfnt_off00017369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17369 6060 bytes
SHA-256: 7b324938e4d72d725e8d0bb98843064cbd67bb9722abda89125d3f685b3796f7
font_02_sfnt_off000187ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187EF 15668 bytes
SHA-256: ed6457ea3d6e26958cca9e55d8d689ab4443466a1ef55eff6661d7da61432d6f
font_03_sfnt_off0001b5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5C8 16276 bytes
SHA-256: 5c8729cf3f452ff6f7901e12cf1ce5e591e2522fbf26e9b978c17675665d0dca