Malicious PDF — malware analysis report

Static analysis result for SHA-256 5676536284ac59ee…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 13:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c870bd3870a9fd58ccbab019d7c8554 SHA-1: 72a1e579b9cf49c1e91f09c25461e37bf21c628f SHA-256: 5676536284ac59eef093e87c7d0f0585648ff5334e38283ad8a65eea52c52249
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files, suggesting a link farm or distribution mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts and links, reinforcing the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://slbreakingnews.com/ckfinder/userfiles/files/zutokesoramaluvovovasipez.pdf In PDF document text
    • http://energy-labels.nl/userfiles/file/36561690552.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/pujelinozakutezozinodage.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/21767691945.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/rajeduvakeme.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/vugot.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/janomodunulewolaf.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/gegulik.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/98790121361.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/34627776436.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/vosilapagogifonalosiloza.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-16/20210916133317870875.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/dozitav.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/dukimezowi.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/77773862949.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/wowuxu.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/nejotobemopexol.pdfIn PDF document text
    • http://vladekoservis.ru/files/fuwerajovolojevusakigegul.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/zibinagipu.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/dodabemesizo.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef4da3fb5a---gazizafapofuxabobiz.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/womat.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/8324895121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=six+pack+in+30+days+apk+downloadPDF link annotation
    • 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_off0000cedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDF 17528 bytes
SHA-256: a9663bf1b59bf992262ec62980cd1d98d9aabc2991304509d13d7cd6da4379cd
font_01_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 10940 bytes
SHA-256: 133519645346f313279f5218e83db90c13d8e2add2943200c4a86d761b6a6202
font_02_sfnt_off000115fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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