Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef2de44dcddfe72…

MALICIOUS

PDF

109.1 KB Created: 2021-03-11 03:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 42353c83be65baadcc6b6bcbb17b9d9c SHA-1: b4e5231a157f53d9498ca74dd7b826d9a5c2b389 SHA-256: 1ef2de44dcddfe72af61e140ce4258e1dcc221478d4e82566cbd7334a8c0d593
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 0.9992

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://vilenefex.ru/award?keyword=ptk+agama+hindu+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386851/normal_5fcbcccf34dcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495849/normal_6003589d1ecd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_5fd8d0395fdf5.pdfIn PDF document text
    • http://true-board1.club/guberalajuvolexixogawm6ct9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5fc697d4d05b2.pdfIn PDF document text
    • http://minuette.me/92860134257htpvk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_602ee09ebfc12.pdfIn PDF document text
    • http://jadebey-x.com/24728152880roxo5.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/4adb7a08-aa8b-4703-a725-8f46134abe12/rajozokejuloguxevavujevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8e76d4-3431-4e97-8243-2efe279c77ee/how_to_write_a_chem_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab55366f-8af2-4882-9306-76264c8ed06e/98376231435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1122fb2-0777-4b6f-980f-5fb59f639de9/2579866842.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/beyonce_irreplaceable_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/star_wars_movie_moviescounter.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_9f728e63fd1948dab1184007b212fd5e.pdf?index=trueIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_7695ee899049428e8fcaf0f97d3f8f11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e04c992-e71c-49af-bfb1-1afee6052240/doxuviwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b821f059-64a1-4435-8794-831b7ead10d0/dolumoren.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC0 5216 bytes
SHA-256: 8e9b15b79a2e5c9c1eae89b6fdeb2538ecf482fae8dce8f3e26227ad235e7080
font_01_sfnt_off00018168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18168 12448 bytes
SHA-256: e51645aa8667dee69fd4a5a88f83422752f11bb578e03f8cabccd8192cfbf139

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