Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c63b3b2031c96b5…

MALICIOUS

PDF

87.9 KB Created: 2021-03-28 19:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fbae0264a36210bc3950ebc5c3399c82 SHA-1: 229eda51fa96490e369c4d39e9552a80c569b5f3 SHA-256: 7c63b3b2031c96b5050cbf21f5a7973e60689f691382d2c6cb71fc715be52ade
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 0.9981

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://gimoguvi.ru/award?keyword=bauma+2020+ausstellerverzeichnis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381289/normal_60221b162f6df.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/QIgigdT/north_star_meaning_in_business.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/9jbjjti/83232846665.pdfIn PDF document text
    • https://cdn.sqhk.co/mezadisedud/ipjcgiR/the_lighthouse_movie_review_imdb.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/jfMGNhi/dribble_hoops_pc.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/lajojabodebidufoxozag.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/gijg3gj/pepate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503987/normal_5ffcc4eada842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415974/normal_5fee08233ffe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421468/normal_6046d4e97744f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_5fc7a8892ceb7.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://tisiwiruligeg.epizy.com/dinghy_towing_guide_2007.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/bus_games_for_pc_free_download_windows_10.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_5c62b7a05d1447668e68cd77c8ce0971.pdf?index=trueIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_dddbbe48eaf64cd09fa89208a78c10bf.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_8f79e8fddab449089712942dea1e7310.pdf?index=trueIn PDF document text
    • http://bizosubage.rf.gd/72795749192.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_cd425a0c78bc4fa9bd269908c2febe77.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_acf7722b33d74d68976a180d18fad61d.pdf?index=trueIn PDF document text
    • http://woxuviju.rf.gd/60118986463.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_096c7cb32b064cf5978436e32cb379f0.pdf?index=trueIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_c5737d962d9f4dc7a8c39dcfcabf4d35.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_06c5f92dc3d942f598e6c25a02c5c565.pdf?index=trueIn PDF document text
    • http://veguxakafopuvix.epizy.com/manuel_d_alphabtisation.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_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 5600 bytes
SHA-256: 24b2f819d40f6f4c70670f0af3c1324c31556aa6ea55a7ec80b0ae7654adf45b
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 12240 bytes
SHA-256: a4db3ecbc1d31dbabd04e19346b78f10b2ab5ede1cc7fba00002b7ed5aaa6564
font_02_sfnt_off00012c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C11 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c
font_03_sfnt_off0001410d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e