Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09fd1da3be1d0db…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 23:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc2f03e8d940a865755e95d1fcc08ec1 SHA-1: d6fa81b7a2aae908de32012366d4bfad9aece5a9 SHA-256: b09fd1da3be1d0db0aa1f57cec1a76f6320e09f7f860654a37d9bb3934657050
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 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://drafthe.ru/uplcv?utm_term=world+of+tanks+mod+apk+android+1 PDF link annotation
    • http://shinaval.ru/userfiles/file/20426090191.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210917_001828.pdfIn PDF document text
    • http://laduses.nl/image/file/97742918602.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/96607420179.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/kisagutet.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/kikekupufefubetofojufeb.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/zezumiteratabazovalox.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/pizeku.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/62279911033.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210901170503.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/70261642827.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161303762c0136---robakojipu.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/95266243953.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/diluj.pdfIn PDF document text
    • http://rts-3.ru/upload/files/kapenesixawa.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/74290396759.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/tapurafogiwodiriwota.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/ledadid.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/76517608075.pdfIn PDF document text
    • http://kaies.net/upfiles/file/5726947422.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/46412740182.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/98059142328.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/kizekaxakazofep.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/pekel.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/84496711136.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://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_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 18056 bytes
SHA-256: 0ebf218569b4fce528c27c01c53c4e5a266c549a5380bd4f83ca0ba3819454ff
font_01_sfnt_off0001151c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D33 10664 bytes
SHA-256: 48187e29fc8d72b2e3892a52a26ceb6d12d10e9c0213f690183f1cb9c288c287