Malicious PDF — malware analysis report

Static analysis result for SHA-256 68553a0bd2f543e6…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 18:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 790d4192c498276d050be6c71fe94381 SHA-1: 01a552b779808fb30c7d8eade2fb7edfc074bb05 SHA-256: 68553a0bd2f543e6c25a2048faebfc0374bb3fe9727594c269a2f05650f31b49
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, with heuristics indicating it functions as a link farm. The embedded URLs point to various domains, suggesting an attempt to direct users to potentially harmful content or phishing sites. The PDF's structure and the presence of numerous links strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://hoigolfbinhthuan.com/users/files/13784595491.pdf In PDF document text
    • https://uudanbury.life/files/file/31704299255.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/16329863795.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/41368226009.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/guzoxofivewiserapivisipak.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/jirozuxejufazitejo.pdfIn PDF document text
    • http://centronegozi.com/public/vadizu.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/rujasilasitaxulijisunav.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/fegivusowafet.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306cca84867---rodezawigafavajefulo.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/notejebadetawujodidage.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090712031294.pdfIn PDF document text
    • http://uhorder.com/upload/files/zanin.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/waxojaxiwibaxeremepenig.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210906_C92358F76BD3C09B.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/votagasakajafak.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/19672567817.pdfIn PDF document text
    • http://plise.org/userfiles/file/70336872375.pdfIn PDF document text
    • http://stattus.com/assets/file/3513520530.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/51115435573.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/divetepefajinamerudorugi.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/69014652579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=princess+tomato+in+the+salad+kingdomPDF 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_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 22656 bytes
SHA-256: ecec03c55c1118fe0ef830ded23cbf1f5bdcad1b13ba960ea80e82f6de929177
font_02_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 10912 bytes
SHA-256: 1d8ca7f5e8065aef67608d449b3c147359c6c4bd340399a3fec2b057217548dd

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