Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad453b850b205f33…

MALICIOUS

PDF

79.7 KB Created: 2021-02-07 16:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 613106dd4bc89f0c3746f91124652069 SHA-1: 64c9f317f27c7ba52b69a6f3c3be901c231c1d2c SHA-256: ad453b850b205f339f2e90ad9b3a122ca26de5d3713571e52e91a7e4caed50c2
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high-confidence ML classifier flagged it as malicious. It also includes a lure suggesting a fake invoice or pricing guide, which directs the user to an external URL. This URL is likely used to deliver a secondary payload or conduct a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://bologen.ru/wb?keyword=audiojungle%20pricing%20guide PDF link annotation
    • https://cdn.sqhk.co/dowusutitozi/fhakHjS/18071963927.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/b8gc9fz/fasegajenowukikegoxogibo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387806/normal_5ff39b9211e66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470839/normal_5ff5a3091ca03.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/OnDheif/class_dojo_videos_chapter_1.pdfIn PDF document text
    • https://cdn.sqhk.co/rukeditele/giRdzez/cardboard_cutouts_custom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444117/normal_601bc9dba90a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_6014d7c1543d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481059/normal_5fd90f28678ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530846/normal_5fe66cb776f05.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/jadere/colossal_titan_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/samojejaridigolal.pdfIn PDF document text
    • http://kasamikapumumo.epizy.com/free_christmas_border_templates_landscape.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/fun_alphabet_worksheets_preschoolers.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/3450665557.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_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 4916 bytes
SHA-256: f975fdf1932712c455634f0b91da580fcedf901db786fcff64b094da7b168eb4
font_01_sfnt_off00010fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC2 10076 bytes
SHA-256: 7a1edc7ee30c9d4ddef4b0af9a24282e6d4541be738e2a7a65db002d859401cc

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