Malicious PDF — malware analysis report

Static analysis result for SHA-256 78060560958fe62a…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 03:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c5b8b408940c00534469467e80372b4 SHA-1: 6ababb889eb5b79093099d9fa9342e5235ace60f SHA-256: 78060560958fe62a55e0eb6d6105815cb2469c5efd9c301dd0e528221722b983
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous external URIs on disposable domains, likely to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect the user to malicious sites, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9dddc6bec---kosukorabixerabi.pdf In PDF document text
    • https://nabijdefossa.nl/upload/files/87203787477.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/dufidexuraveb.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/80158170609.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/10773652897.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/nilexubegipivarojisok.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/41172586133.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f111c094c0---9399743729.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/kirajobefi.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/wefiterozoworoje.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/80291717204.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210902232423.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/85235176591.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/niged.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/nafowonujefujoteda.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/bajugulowezekubuleluzuz.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/16686933475.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/8140299385.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/69737623340.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906135357186907.pdfIn PDF document text
    • https://gerbangkuis.com/contents/files/7785764127.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fodilir.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/tasosizolo.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/55118939166.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/lesirebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=idn+open+card+apkPDF 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_off0000bfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA6 17392 bytes
SHA-256: 12c75d41fdb85dada81de0d3828030e008d0ac2987deaf3a425f9999d9c7b78a
font_01_sfnt_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 10148 bytes
SHA-256: 4a06aabc60a93e458e80dfa73a81fbda60bc3ad5667e1fa2a4b70a4e94c84d9b