Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b07408e6198e49…

MALICIOUS

PDF

65.7 KB Created: 2021-04-05 10:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f8ea891a85e0ba10ac7569478d80d2f2 SHA-1: cd2eab7f9ecb0ac3390cbd1181f5af297861c399 SHA-256: b5b07408e6198e49404fbd87971fd82f4f3ad1eb7fb12bf5d21bdfd6111cafad
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a mass external link farm and an SEO redirector, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK strongly suggest this. The embedded URLs, particularly the redirector URL, are key indicators of malicious intent. No scripts were extracted, but the structure points towards a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/123?utm_term=maine+pyar+kiya+song+salman+khan PDF link annotation
    • https://cdn.sqhk.co/sovajepuxe/SujfgeS/gepilekokozikawidefukomuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470028/normal_60153924a61fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446378/normal_603e97c39a747.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379718/normal_5fc9a1cbe9026.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezima/ehcggiG/330737254.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/eIbgeia/bilosotubulujejodozinup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa3a7c2-068b-44cb-afb5-4f7919dcb2d3/32797353689.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_c1c8a9ff99c94299bf413e2711c2b41d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/630d8457-84b6-4e28-953c-08d2da12e8cd/what_is_the_portal_circulation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31094be4-855b-45f0-aeec-7a999b5cf39a/hp_photosmart_d110a_ink_cartridge_replacement.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_2a6de955b4a64433a9e4ec5b286c1d07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/937dd408-1ffa-4fce-a83e-de42944d4ba0/8253594625.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_off0000c283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC283 5404 bytes
SHA-256: 64dfd7396706ef9c01b29f839c9aa6ae18c8779530f9d9d49e06bb7f02eed8f9
font_01_sfnt_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 10480 bytes
SHA-256: 818688611759a749abc3466eb66a5aeae18fada57f9f5b778ee23b37acd3744e

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