Malicious PDF — malware analysis report

Static analysis result for SHA-256 49aa3e58b70a33b1…

MALICIOUS

PDF

71.5 KB Created: 2021-03-31 15:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 416320fe52f9592c52aa847ab9ccd769 SHA-1: 733f9e2f746e0e498f61ca18b21a79c738be5064 SHA-256: 49aa3e58b70a33b1e09181cdd6c39442cfc2bf0d5519031d87bd51c9c8d8bdb7
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it uses an SEO redirector for phishing. The document body, though heavily obfuscated, contains text related to a 'predator prey lab' lure, likely intended to deceive the user. The primary malicious URL identified is seumenha.ru, which is used in conjunction with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=predator+prey+lab+the+lynx+and+hare+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424981/normal_5ff564d7c0718.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/7430807304.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489042/normal_5fc639f1bb9a2.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/jegcXjg/photo_mask_editing_apps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_600d2634ebe0b.pdfIn PDF document text
    • https://cdn.sqhk.co/rowavarop/iagg4ii/39728834517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446165/normal_602290de3b2d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_605bf32025fcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457312/normal_60056328ea9aa.pdfIn PDF document text
    • http://wajazenizur.mywebcommunity.org/bus_eireann_23_timetable.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485580/normal_5fce70b2b3cdd.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/jijahjf/xasobepiwenunuvapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448535/normal_5fdc0485e491c.pdfIn PDF document text
    • https://cdn.sqhk.co/musosesuguju/kTViaha/bataille_de_verdun_rsum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_601cefb931e70.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/Gih6Jje/gupevejifufisefavipo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421366/normal_5ff01631cffc3.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/watajive/casio_pathfinder_pag80_watch_band_replacement.pdfIn PDF document text
    • http://visevagopar.onlinewebshop.net/business_communication_notes_for_bca.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/8020388104.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/julalikipataxux.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/warcraft_2_full_movie_in_hindi_720p_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/64323179598.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/zijarubukemapemi.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/how_to_replace_thermal_fuse_in_kenmore_elite_he3_dryer.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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 5448 bytes
SHA-256: dd91b4ab674a1dd7951422860991f28bb39dfd866c63af208ae17d31e15c1cbd
font_01_sfnt_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 10592 bytes
SHA-256: 9dab596965a5095b550a1a5eca713e83e20ffdea4d776d4567adc4d0d507abfb