Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d7b2e9664ac69a…

MALICIOUS

PDF

89.2 KB Created: 2021-09-12 02:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 28d63bb815e4080abb477fe678ee1a0e SHA-1: 8eefa4b8d9c77a2aaf4f3986740d44e1c9fe05f9 SHA-256: f5d7b2e9664ac69a8ad6426d1ecc3bc9f40fa6e7454e264d57997d6bb5f702dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9942

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://hkbca.org/UploadFiles/file/20210912071026109.pdf In PDF document text
    • http://pp-aqua.com/userfiles/files/pevemilutus.pdfIn PDF document text
    • http://kechengchem.com/upload/files/kekonuroxofidaxanizeke.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/lelujunonupozotu.pdfIn PDF document text
    • https://dukupahit.com/contents/files/fememuxet.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/nobume.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/23564252921.pdfIn PDF document text
    • http://primaneighbors.com/userimages/6278167774.pdfIn PDF document text
    • http://3q1p.com/upload/file/2109080205014782524pajs0mwbnmf.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/73154111079.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/74443047770.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/lapulemoperinew.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/jurobevonekageromegakazoz.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/24326042410.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/95220981131.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/34800077450.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/nuniz.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/48452156440.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/zovawanesuzolavomemi.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/93120482647.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/48353827211.pdfIn PDF document text
    • http://soundupgrade.nl/site/data/ws/files/98365463795.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/gunisesuluweju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=motivational+words+beginning+with+aPDF 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_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 10812 bytes
SHA-256: a1bae34808495b9f8666b6da866b51897e9656e2864401774a3e122d1163a326
font_01_sfnt_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 17312 bytes
SHA-256: 2ac8faa2e0d4434d35be03b999150bee63a506ca1dbffbe5e74f3cb66da44a5a
font_02_sfnt_off00013f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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