Malicious PDF — malware analysis report

Static analysis result for SHA-256 358a5f6247b7600d…

MALICIOUS

PDF

71.2 KB Created: 2021-09-13 05:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87595f74e3dc74fecb623a88da38d38a SHA-1: 9bdf9d0beb92aea8e23b15f75ef9bcfad8ee1ac2 SHA-256: 358a5f6247b7600d077366c1b053d4d26187132476851c33b7af020254e353c2
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports this, indicating a lure to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baigiangtoanhoc.com/upload/files/59284902782.pdf In PDF document text
    • http://piotrkowska77.pl/zdjeciafile/76992986395.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/74052810597.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xijufifakejesapimilutigad.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/nobuzesavo.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/lujifemomarekodenovutow.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/fizobumiwijexobetawir.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/7281286396.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e96d3d8a3---72898893228.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/dotunavemekelisemurolor.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/zixatogodivuvakugubij.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/36620677576.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/pokamigefika.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/sipivorasofa.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/18635290997.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/bewasefujunefagebo.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/sawikixeti.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/53403853668.pdfIn PDF document text
    • https://blokhol.com/upload/files/wedanalixebukasato.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/dotasowegegugobuwazafufu.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/97105688972.pdfIn PDF document text
    • http://foxadv.net/file/geruwivepede.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/lesepeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=god+of+war+2+apk+for+androidPDF 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_off0000b6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D4 10384 bytes
SHA-256: ed876781becfbd05a947c47bae3e641ac689a37eb9ff35fa95b4987b73d58bd4
font_01_sfnt_off0000ce8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8A 15968 bytes
SHA-256: 78439b52c651789861a6f9fd484a9b5e0299cf36fc8646596c696d8bd3a490f6
font_02_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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