Malicious PDF — malware analysis report

Static analysis result for SHA-256 01aad11aa31994fc…

MALICIOUS

PDF

85.2 KB Created: 2021-02-15 02:55:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2b151debc203ce308fb2f74b9e3eb9a9 SHA-1: 8d0bdf1469ba484a9d604d5001cfea0c2c3609ef SHA-256: 01aad11aa31994fc51a192599a3bf500684f3eb32dde584dd5d0db70a49673b1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on suspicious domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, suggests a lure related to a 'book trailer assignment'. No scripts were extracted, but the presence of numerous external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://leonvi.ru/123?utm_term=book+trailer+assignment PDF link annotation
    • https://cdn.sqhk.co/wemofisejaf/j8Jiehi/49398602126.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/S3nbsIs/pekejuponudevuzokena.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450514/normal_5fd068761e895.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/jFjcxYG/coffin_dance_meme_song_remix.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwifudu/gjIEkhg/53175443289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454430/normal_60206eca3bbb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455399/normal_5fc9a73b47f57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_5fe7e5f88c9a4.pdfIn PDF document text
    • https://cdn.sqhk.co/manigonodapu/Tq7iijf/bible_stories_for_preschoolers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451363/normal_600f0742c5ce8.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/oehhTic/minecraft_lan_proxy_dedicated_servers_on_ps4_xbox.pdfIn PDF document text
    • https://dukopovofozevi.weebly.com/uploads/1/3/5/2/135295758/1311213.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/oiiiiFf/nojiwutar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_601f5931adf28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_6022a082b2c12.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/jbMoGgg/best_online_piano_lessons_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wifiduxezo/sejegefiri.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/53636873297.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/filmora_free_softonic.pdfIn PDF document text
    • http://www.readwritethink.org/classroom-resources/lesson-plans/book-report-alternative-creating-c-30In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 4904 bytes
SHA-256: e28a7dc38e0204e95461ec1ab516577241fc311ee2b7f72529434273a8bd1159
font_01_sfnt_off0000fdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD4 11184 bytes
SHA-256: 847f698090f6e149b00b129303a61996a87e04a60e4cb47ff33d8570f7178fd2
font_02_sfnt_off0001242f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242F 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf
font_03_sfnt_off00013930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13930 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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