Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d898a9f8575081…

MALICIOUS

PDF

66.7 KB Created: 2021-02-27 04:20:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3176a798618d324ef923c422daacdb64 SHA-1: d90998622d64ca8e2a59038e42f1974abd02bb90 SHA-256: 63d898a9f8575081a80d40b4b1ad57a44d5ab3c68f67b71771679817c6dffdaa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=baby+girl+names+with+kai+in+them PDF link annotation
    • http://tamakar.tech/64394176826vo7sv.pdfIn PDF document text
    • http://clobuss.ru/prayer_wheel_dnd6si4m.pdfIn PDF document text
    • http://lynciguest.com/maze_runner_the_scorch_trials_full_movie_download_in_hindi_300mb6dfqj.pdfIn PDF document text
    • http://netewe8.xyz/kakibafebagpo4ux.pdfIn PDF document text
    • http://sfhgfje5df.xyz/nobelelbnz9.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/jhcjefc/super_discount_liquors_elizabeth_nj_07202.pdfIn PDF document text
    • http://itdiscounts.pro/assimilation_policy2xpeg.pdfIn PDF document text
    • https://cdn.sqhk.co/gojapawareke/8hiiCge/wivuge.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/idhddjj/fivestars_topup_recharge_promo.pdfIn PDF document text
    • https://cdn.sqhk.co/nobegasosev/cahadhh/tienda_movistar_el_salvador_celulares_postpago.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/lekezaru/dobivasija.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/51360788831.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/51829495709.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/vim_insert_mode_cheat_sheet.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_off0000c7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CA 5544 bytes
SHA-256: cc8223489a865f7275b167a98d87a6040e416fb45057af967ae7e6dcf9171f90
font_01_sfnt_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 10288 bytes
SHA-256: f19bde9350b6cefe02273336eec80912f59f86b457068e6487fac836945d7044

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