Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f1b9440c0a4138…

MALICIOUS

PDF

81.1 KB Created: 2021-02-25 05:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1ca5a6377be2ecb8917bff80a167c945 SHA-1: 53af55ab05c9b2864ebb8affabb8e1d6c48543e4 SHA-256: e5f1b9440c0a4138670335883c53e604615ccf094e35dbe8062a2b470743db0f
186 Risk Score

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://seumenha.ru/123?utm_term=directions+to+divine+mercy+shrine+stockbridge+ma PDF link annotation
    • https://mubuxepuvu.weebly.com/uploads/1/3/1/3/131383429/ff9451051185.pdfIn PDF document text
    • https://kipokemob.weebly.com/uploads/1/3/0/7/130738996/e66f01.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/hcYiiie/bubble_puzzle_apk.pdfIn PDF document text
    • https://lenopeseku.weebly.com/uploads/1/3/4/0/134040497/donuwo.pdfIn PDF document text
    • http://evatopshop.xyz/457805612614967y.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/ahhgdjg/14966366127.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/wujezomomesebip.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/hfAhjih/tifukubimanufizirovuneb.pdfIn PDF document text
    • http://energierecrute-emplois.com/804439590123v1x4.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/bighgQB/84030072656.pdfIn PDF document text
    • http://yourdesk.website/govekimorini0w4.pdfIn PDF document text
    • https://fuzedefona.weebly.com/uploads/1/3/4/5/134578490/vosug-vulolezipet.pdfIn PDF document text
    • https://cdn.sqhk.co/goxepijikun/dgcfOgh/98310664182.pdfIn PDF document text
    • http://nout-prokat.website/zewekosupufawapowixusoaubib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medexode.atwebpages.com/sukibo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 5688 bytes
SHA-256: 26f5f48a15357866b702a478b6fa7f8aec2052f130dbd686a40033e3810111c1
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 12104 bytes
SHA-256: b82fcc8ab952ef80cf94fabec2e3ed846dbaf8e8ab1ddebb539f68f09df11c2d
font_02_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 16096 bytes
SHA-256: 605d9e4239b974f6d9e1de1faf493610cf9608543c7c5495bf40ce0088b12bce

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