Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f9d2418231d954…

MALICIOUS

PDF

79.8 KB Created: 2021-03-20 04:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 08da544605c4ea2b41cc897c3a99bdca SHA-1: b2ddd982a6165c8878c592c06cb1fd923d5c2797 SHA-256: f1f9d2418231d954d35f7c94741f12f4156a89ac9e028657e2600965c0c99130
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9957

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=how+to+find+area+and+perimeter+of+shapes PDF link annotation
    • http://lnstagram-verifedbadge.com/why_is_wii_sports_so_expensive9cf3f.pdfIn PDF document text
    • http://vpntop.info/gikiretemr12ht.pdfIn PDF document text
    • http://sallely.xyz/54514790393clfgz.pdfIn PDF document text
    • http://alphabitx.com/wuxidiqptnk.pdfIn PDF document text
    • http://100p-f.ru/31950164454k51vb.pdfIn PDF document text
    • http://artdebug.site/xuribezemunalaxizixiwulg3iu6.pdfIn PDF document text
    • http://creditscorefix.info/lobojupuxatunujilapasx03.pdfIn PDF document text
    • http://orehi-siberian-force.online/free_download_crochet_patterns_for_beginners0r0y0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b403ef4c-c144-47c9-99c0-9421fad8a978/2575111695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89de449-d5e6-4d63-b67d-48def7fe3f0f/fivumadekupade.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/faxatusatolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa1a490-6552-42dd-b6d1-2b4f35f61618/51150422630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d92f83b-a39a-477b-a32f-e2c67830acc9/does_anti_inflammatory_diet_work_for_arthritis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abfb3f17-85c4-4b9a-8fab-77eb17d0a5e7/tudalikatepugutajovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/522ec2c0-2c14-4502-8cd0-706914315e88/lamabopanowadajik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/367b13c1-1240-4d22-8b83-e992218b00d6/hansel_and_gretel_2002_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/panasonic_canada_toll_free_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b64b8f-60bd-47b9-9be9-a85cfae60f29/jiwoxakemugawakolanexife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c7c3bbd-9bd5-47d5-8d2c-b394eb646094/biblia_textual_app_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4beccb0-5bf7-4b7e-98dc-0db7dc8f1950/kenokofaminejedatatit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ddc943-221c-45c7-9c33-685368cc2db7/google_search_history_on_samsung_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/moduronalobajegekakowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b00d0491-61b7-4a68-b2b4-f1e2ce1e42a2/list_of_moral_values_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/jovefofem.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/mark_levin_1936_soviet_constitution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cabfbfc-5cb9-4c6e-aee6-358efc6f6c2a/58691044974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b4e210-e800-44a0-be9b-714ffd7aed51/tubira.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_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 5300 bytes
SHA-256: 18b446d0c6c0403da84b402aa607bc79717922b1442821da3067921ee6abbd7a
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 11500 bytes
SHA-256: a044ffff71f5953fe49f778cafbfe4586ebe5297cbfd77fa340e1abdd65c3869