Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae16015a7898eb8…

MALICIOUS

PDF

112.2 KB Created: 2021-02-25 16:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c8e19216c70d35354e0da826431361e7 SHA-1: de8df2cba6e104f86f704e2f1646b257140e575d SHA-256: 9ae16015a7898eb8578f0a031437ec85c3f5aafebf300e544867add73d09921b
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a game walkthrough, which is likely a pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=metro+last+light+redux+d6+walkthrough PDF link annotation
    • http://kopuvimu.scienceontheweb.net/vita_spa_hot_tub_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/jaBjc5m/15087108397.pdfIn PDF document text
    • https://cdn.sqhk.co/livixugakuf/tjfCjj7/hotstar_live_cricket_match_today_online_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/ijJigxf/52983398872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487184/normal_6036e12ba3f4b.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/PDhdji1/tetezizisalokepi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372721/normal_5fc9f7b0a9542.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/chibNjO/bad_day_daniel_powter_lyrics_deutsch.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/jbyjiif/dialer_monitor_resume.pdfIn PDF document text
    • https://cdn.sqhk.co/lasetipulos/a1k4Tgh/93480206402.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/onan_7500_quiet_diesel_generator_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/zixifazod/PnSBiaI/jurassic_world_the_game_dinosaurs_level_999.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/79727604487.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474997/normal_60013cd8f0ba6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416935/normal_6008d5b02bfd3.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/xqfgiuS/paypal_credit_increase_denied.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mevexunimapo.epizy.com/91593302559.pdfIn PDF document text
    • http://gelepovasogadax.epizy.com/alejo_carpentier_concierto_barroco.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E79 7776 bytes
SHA-256: 250a32294133370883b31551e41041079dc5ffe5016706bd115ef22135568b96
font_01_sfnt_off000178ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178AD 5468 bytes
SHA-256: baea6f2455032d7cd50e4df1f2360ba33f019f9e1aa8d1d3bba4b15ae89e3d05
font_02_sfnt_off00018b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B60 11376 bytes
SHA-256: 9e42cffddb373c0be023570a7d268dd834cdbf9e3ccb6b97df3c0f4ac3b308a4

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