Malicious PDF — malware analysis report

Static analysis result for SHA-256 490aceb7b8d629a5…

MALICIOUS

PDF

69.3 KB Created: 2021-03-10 22:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 31a3647f5408c84c930abe214b4f152e SHA-1: c41d2652669342ddf5af1beff31cee0c1a71d9e9 SHA-256: 490aceb7b8d629a5b7b22329e9ed264a44ae7cbb794d090fc14b3bbe10eb7165
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'xajibur.ru', suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, indicates a lure related to 'Dawning of the day bagpipes sheet music', which is likely a deceptive pretext to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/123?utm_term=dawning+of+the+day+bagpipes+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405662/normal_6025395feea87.pdfIn PDF document text
    • https://cdn.sqhk.co/nezuxada/c8m9ljc/find_greatest_common_factor_free_worksheets.pdfIn PDF document text
    • http://fosavaxenu.mypressonline.com/how_to_extend_fios_wifi_signal.pdfIn PDF document text
    • http://totalcreditcheck.info/liwasuguzimugojexansvoyt.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/7gdRshg/os_11_lock_screen_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_5fe62b07d1a66.pdfIn PDF document text
    • http://wedasuf.getenjoyment.net/jodorolixujid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_5fd85a8857450.pdfIn PDF document text
    • http://wifisef.medianewsonline.com/sixugelija.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/zumesagusutumomitoje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444875/normal_6000b94657000.pdfIn PDF document text
    • https://cdn.sqhk.co/retirifurew/jhbZDAy/gobipelaj.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/d3F3Kjb/254337675.pdfIn PDF document text
    • http://pimidemo.iblogger.org/42701861681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_600fe3a065836.pdfIn PDF document text
    • http://lesantyqas.online/xirini6avdq.pdfIn PDF document text
    • http://car-den.ru/bekezemesezejuxvqtio.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/wegemebufojafak/dokovakesu.pdfIn PDF document text
    • http://kariwukopufemu.rf.gd/fiwuzili.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/71852520639.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/caminar_sobre_las_aguas_pelicula_ver_online.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_off0000ce75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE75 5776 bytes
SHA-256: 208c9ee150778ed6fcebb312c4b4c16f81deb8296a51cee7f0fe6d4a3f9480b5
font_01_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 11256 bytes
SHA-256: 9bfcaad6b88cd7aa0d272429b7d4746d55e427ff506f5378ce030299d2cb88a0

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