Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a6921da7df8fed…

MALICIOUS

PDF

103.2 KB Created: 2021-03-15 00:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 92904b4a3903dc38e680566ae46dee1d SHA-1: 732b5c246d16edc6e07be9a4efaf8c3454e542fe SHA-256: 66a6921da7df8fed13693b7fc7065c9eca58dbe5baaeb5a8efc4a2cded42037e
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 0.9997

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://maypoin.ru/wix?keyword=16x20+shed+with+loft+plans PDF link annotation
    • https://cdn.sqhk.co/pumafuki/TzkGLjj/chowka_kannada_movie_full.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/ihhbggm/bombay_grill_brooklyn.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/Eifhhjg/anatomy_diaphysis_function.pdfIn PDF document text
    • http://goodshopsales.xyz/ti_nspire_cx_ii_t_cas_occasion23kjq.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/NzZhaib/old_man_s_journey_achievement_guide_maka.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/answer_tea_malaysia_menufjf9k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_e1f54cd8b563424d886d7502e4e7235a.pdf?index=trueIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_435fd4af6e1342cf844385210571789f.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_2afad8282e1240d7ba566f911fda7190.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15ff891-c338-421d-94b3-faf13081ba62/katolaxinefabutegape.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_ef488cfbd6044f4fbb542e8cf2b436ba.pdf?index=trueIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_02de349c95754706863b69601fbb93ce.pdf?index=trueIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_94f69902df4c4f19b1eee42eeeefd1a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9a76cc-5a99-4815-af80-c8c8428ef5e0/whirlpool_gold_bottom_freezer_refrigerator_ice_maker_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf53bea9-60c6-4ff5-8d99-4e1db3452e5f/how_does_the_stock_market_work_for_dummies.pdfIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_f56e205334424793a0d7e8b9e82e0321.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc0955c-4968-44ca-aa18-1e81a1003cb8/22806314074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3a64753-a76e-4252-9714-31dba17b94a3/how_much_is_a_brother_10_needle_embroidery_machine.pdfIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_0c76fe89a876448da742a2aad8198dbf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac0be16d-53e2-46ec-b3fd-c3430d5004b7/the_cheating_wife_wattpad.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_c26e5c98bc5940d7ac36e06f5723e0bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9d8978-2ed9-4b69-8cfa-7de5782d0119/61735265159.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15735 5580 bytes
SHA-256: 11b563e66db20c6b88986c8b6179403d2596bd48a95c293134ddcc97a28fc1bf
font_01_sfnt_off00016a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A50 10744 bytes
SHA-256: 520d0d6d49459bca21cd0d1c3638d80bacb1f2b24a1dfa3ba838b7267192d617