Malicious PDF — malware analysis report

Static analysis result for SHA-256 9862d6e12888e624…

MALICIOUS

PDF

76.9 KB Created: 2021-03-30 02:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 810a2e469a1729c8bdb4d559a15a67e9 SHA-1: 9e8aea200b88eca2fbd1888a529f60711e77ab21 SHA-256: 9862d6e12888e6240732de0db15ac02f39e18261e538ae0264c7300e71e24b00
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 0.9992

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://nipisod.ru/strik?utm_term=hp+deskjet+5550+replace+ink+cartridge PDF link annotation
    • https://cdn.sqhk.co/posojuvapono/7heb4Rn/fishing_diary_hack_game_download.pdfIn PDF document text
    • http://lorozetuwivu.medianewsonline.com/54752382079.pdfIn PDF document text
    • http://bamupiwabibajew.mywebcommunity.org/how_to_open_a_jammed_oven_door.pdfIn PDF document text
    • http://studyweb.site/48007711297j9icf.pdfIn PDF document text
    • http://salonly.xyz/358175840898zd9r.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/jsiiTER/othello_act_2_summary_sparknotes.pdfIn PDF document text
    • http://pushbiz.fun/sundara_kandam_tamil_ebook_free_downloadxwlq4.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/VrygWjd/snow_atv_bike_stunt_racing_2019_mod_apk.pdfIn PDF document text
    • http://drnextact.xyz/plantronics_s12_manualtkgda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/31345715408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2cda80e-6a27-488d-8a54-5163247223d9/paveki.pdfIn PDF document text
    • https://be8414c4-f2d5-40c6-b8a8-1a5561a1dac7.filesusr.com/ugd/a452ea_488d53b361c246339398a3ec2255a96c.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_e95def12cce44cf1ad73e3c2b3cddbbf.pdf?index=trueIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_763cfa9fed5341a990ce0a032f83c11f.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_e5286a3deeb741778cee0a7aecaa7bc1.pdf?index=trueIn PDF document text
    • https://17500468-634e-4f48-81ad-48a4a068d6fa.filesusr.com/ugd/dcac76_00e236a410684ac6ae28343f6a2375b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27914d5f-2a2a-42e5-bddc-71dab0a8e6c5/86761086988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff280696-95dc-4d31-9444-ebc1d374fccb/how_many_carbs_does_a_chai_latte_have.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/d2_izanagi_s_burden_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/dusosalibeviminaduxogul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14808d91-7aa9-4414-b194-6d31450ba2cb/when_did_ancient_times_end.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/leribufutoxenasenexuniz.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/20430651959.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_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 5608 bytes
SHA-256: 15db200a86ce8d3c0e194144190e8af063872e2590e1ebbd72e7c7583a8ff30e
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 11068 bytes
SHA-256: 8291eefc9fd9bd1e07b8968e6d96b12b4142c66907fc3ef54eefce90813a72ff