Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5f38d782af0be0…

MALICIOUS

PDF

130.0 KB Created: 2021-02-18 19:06:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 80e91e464fe20621ed78f5522bfacf76 SHA-1: bf769620ace8647bbb910a8c1377b87555e69474 SHA-256: 8b5f38d782af0be00b3cbf6d33a6b19c09e53adfa19e11db283ba59d743db1c5
222 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, and multiple heuristics indicate malicious intent, including a critical ClamAV detection and ML flagging. The document body, though heavily obfuscated, appears to be a lure related to DVD player region-free settings, which is a common pretext for phishing or malware delivery. The presence of numerous external PDF links suggests a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/123?utm_term=how+do+i+make+my+lg+bp250+dvd+player+region+free In PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/21e122d1b91e.pdfIn PDF document text
    • http://expo-kit.ru/casio_g_shock_mudman_solar_compass_93003thnm.pdfIn PDF document text
    • http://autobuff.xyz/xipekuwommf08g.pdfIn PDF document text
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/toxubax_sidaborawoxu_wusere.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495985/normal_5fe3eef611366.pdfIn PDF document text
    • http://parralax.net/tomazikopjkc7x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487641/normal_6008b215b3a75.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/8006814.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/gisujubolidine/mofududavizofejunimitaj.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/jujegutunasu.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/vaginiguvalomuko.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/dinuvifegojubilipe.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/ultimate_video_player_wordpress_plugin_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/avengers_infinity_war_bgm_song.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_off0001bd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD10 6000 bytes
SHA-256: 21a6a5065774a8cf55cf7010f8a89aff9cb6851f5cf0789f845416f2242cddbc
font_01_sfnt_off0001d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D18A 12264 bytes
SHA-256: 6c41f7615482b60ea3934d9212f2cb2764030538bcd0484120a427b8edc5bfd0

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