Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da794e66a910ee4…

MALICIOUS

PDF

80.2 KB Created: 2021-03-22 02:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 57c4b8ffdbba049a3f6c06ebd3b37519 SHA-1: ae6222ade2b12c3cc677a78677c3db4dd1759446 SHA-256: 5da794e66a910ee4e40797d1723822190d1f2c5f9879ef46594a7f5c6dd3d574
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many of which point to SEO-optimized PDF documents, suggesting a link farm or phishing campaign. The primary malicious URL identified is https://vilenefex.ru/wix?keyword=tv+guide+listings+champaign+il, which is likely used to redirect users to malicious content. The document's content, though obfuscated, appears to be a lure related to 'tv guide listings'.

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
  • 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.
  • 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://vilenefex.ru/wix?keyword=tv+guide+listings+champaign+il PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408333/normal_6019730a6f3a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367278/normal_5fe307bfec6a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474719/normal_5ff66284ac19c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488582/normal_6040acd0270fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468827/normal_5fc64207b85d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477155/normal_5fd29cb498cef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_601d5b537b323.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/suzixegazunow/lawson_portal_installation_guide_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/32994641739.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/bus_travel_ticket_format_in_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a007baf1-e7ba-4ebc-9203-36cd1e7d0cc1/zulabipikefemigibewigi.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_082428d9a22747f5ba33413b7f819482.pdf?index=trueIn PDF document text
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_6eb09900e469456ead7f7930e500f466.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pobixedele/13321696445.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aac74a2-7eed-487e-9e39-929d95ad3880/the_lord_of_the_rings_4k.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/motulubotamafevuge.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/69201939452.pdfIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_c24a21bf9d834b7880c8db32581d83ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/bidekugiwuwino.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 5172 bytes
SHA-256: 9d44a75900cd42a9154371ac184e4ed78159a62255ee4270e4da42adae76b0a6
font_01_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 11716 bytes
SHA-256: bdc147405e767c720e8ab695450d97d069e391a896b2d339d3b10d4599885364
font_02_sfnt_off00012398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176