Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3b360867989c49…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 02:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 99d1bea031eeb924d01405b4550b58ed SHA-1: dcf8b7173082b9b28fe9291d42788187276bcdce SHA-256: bc3b360867989c49e49dcf1cab91b181decc8c4a22001b55930593e412c99ec2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a distribution or phishing campaign. While no scripts were explicitly extracted, the nature of the PDF and its link farm characteristics point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://htapigroup3.com/contents/files/robivizas.pdf In PDF document text
    • http://auroraenergyproject.it/userfiles/files/65985435796.pdfIn PDF document text
    • https://hotelcorona.ro/files/lilabosifuvevivudikefal.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/41477557171.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/45667019639.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/27054635131.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/gabubupubabil.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/72679122845.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/14240813226.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/buduferiforidezibarotoguw.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631011614918072390.pdfIn PDF document text
    • https://expomediainc.com/upload/file/88326821883.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/resameluf.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/88169909472.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/togibamejeta.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/72063900869.pdfIn PDF document text
    • https://funke.be/data/file/tijukumo.pdfIn PDF document text
    • http://www.grifin.sk/files/33465859349.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/vajupofuliwow.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/nafisewimuzebevawuk.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/48429587291.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1c09bb52605b4c271d77a5ec0d469330/94414243838.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/liremifelew.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/libunaferofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=no+apps+working+on+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_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 10448 bytes
SHA-256: 21fb3f572e6d0a79249fc0b292b482c1a695558242cdf2298b6de80fa1c2b430
font_02_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 19480 bytes
SHA-256: 400b3b8ac41499efe3359c1d01f6643bc469ddd58a369b827084353672ea1317