Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60f77e4cd6318f8…

MALICIOUS

PDF

74.9 KB Created: 2021-09-14 02:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66d02d96bdaa81ebef0616edc57c18ec SHA-1: d8f48b59d2c80c0a45ffba3c545e05cf81569ef6 SHA-256: a60f77e4cd6318f8f8c6fe0f0f1128429d3ee59d39920ec684fa25b85f6908b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and structured as a link farm, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jcpingie.be/public/files/mubewoledarepumubamezej.pdf In PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/49863112452.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/39795274535.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/bemiranirubefozuwivo.pdfIn PDF document text
    • http://levotst.com/uploads/files/xokonotapa.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/62824213955.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/cnlbnbo8ir6hi14ghlj9mu2d70/6108733763.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/meziresazipufimotevelis.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/gijupodukelumefefu.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/29931454212.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/32285586059.pdfIn PDF document text
    • https://actorconseil.com/files/file/25877548828.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/7792720351.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/79821498063.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/musepifelekosofizupawiwa.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/gufobezitajex.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/82598141221.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/11981102886.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/90174103406.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/4348264839.pdfIn PDF document text
    • https://trexanh.net/upload/files/bisapofebe.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/zorivikolumekad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=text+to+hexadecimal+converterPDF 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_off0000c3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FC 16416 bytes
SHA-256: c963b391d9c55d8375a2078b7473cc1b65b432b8bbd8d4257e96919c898d715a
font_01_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 10596 bytes
SHA-256: d25d25d19a2d8d2c6c27e7fc5a3c6485245bf7c74b0085a416d0bc54d6cae739