Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee825155f37542e1…

MALICIOUS

PDF

72.3 KB Created: 2021-06-03 17:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3412ce45c31f19da11b4e9faf42b58e2 SHA-1: 71a7bc918e2cd722dad2185d71dcf21b02178420 SHA-256: ee825155f37542e12f9564e0ecc3dd6e5bb8df32508155a20ae74f50ccb066bf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://krisoc.ru/pbw?utm_term=minecraft+online+free+download+pc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fcf1b11825ca.pdfIn PDF document text
    • https://sozakipebi.weebly.com/uploads/1/3/0/8/130814717/2157029.pdfIn PDF document text
    • https://dakuwiremab.weebly.com/uploads/1/3/4/9/134901294/sunezejunave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469645/normal_606a3eb85d899.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491152/normal_6006b6332bf17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_6066fe16d9b39.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/1a0ea904-766d-4dcc-a9a8-8f25471fe4a7/88486135897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c028aa01-7890-43a0-b561-4c5dc136815b/fapobigufun.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/vikimijodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f02fc165-3381-4f6b-81c1-302499451c7c/what_can_you_do_with_leftover_jelly_beans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8920d006-76e2-466b-8202-d40aa275abcd/75912014165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fe76982-ff0f-4890-8115-6ff20b5e37ae/nustep_t5_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57d2536-11c4-426d-a881-6a4cb276148d/15458604563.pdfIn PDF document text
    • http://rimogeto.pbworks.com/w/file/fetch/144427854/29844620928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/726a0bee-b72d-46f8-b2bf-a2412eafaa4b/how_to_ace_calculus_the_streetwise_guide_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536c0b06-5e54-4550-8434-7a4ca620a2fa/chanakya_neeti_marathi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b10fbab-6fdf-4206-84d9-147820dc8a0d/22558558439.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/what_are_language_functions_explain.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_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 5068 bytes
SHA-256: d0ec28f684b8922c0e0f0531fc587c43dbf471e4ef721c0ddc69a4537edc507f
font_01_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 10464 bytes
SHA-256: 39864f97de00fa7ce63dce6877b799b2667f09f1dfcbf6d0d6e98d4f586ebb24

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