Malicious PDF — malware analysis report

Static analysis result for SHA-256 455b95d88eb4de13…

MALICIOUS

PDF

70.7 KB Created: 2021-09-10 23:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a80c6544179bdc94891ebeb30bf470ee SHA-1: ca147156ce609656151fd735062cb5c20d3765f1 SHA-256: 455b95d88eb4de135b9eb73ce18658a3ff12e07160bca00eb659f9db3f3b4810
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, hosting numerous PDF files on various domains, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the presence of external URIs and the link farm behavior points towards a malicious workflow, likely involving the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://divapharma.com/uploaded/file/6431216600.pdf In PDF document text
    • https://moolans.com/uploads/files/raxidiborewisopata.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/jijefevojavugisuzazuxapa.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/zirakebaxegur.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/92581426264.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/19818077098.pdfIn macro / runtime command snippet
    • http://www.klimavill.com/data/editorfile/66025744857.pdfIn macro / runtime command snippet
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b9b832814e37398f3660ce3e6ad82f0e/60940874600.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/54359691736.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/kumedulidexufisezokegogoz.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/15833318212.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/zugorewuxudim.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/41703486006.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/soxejazawabenifunoxer.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/gotabivugokurozafuvuw.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/kuturukukano.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/pivimemut.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/povofefasikok.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/kukif.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/46822991956.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/diribudit.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/jesorefegumafaloj.pdfIn PDF document text
    • https://thingstodobahIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=shadow+battle+2+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_off0000b4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E3 10536 bytes
SHA-256: 39b5bfd1e422badb57e10ea115f2bf0bbc186322ad23664ed785aa58ffcb8d71
font_01_sfnt_off0000ccef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 16008 bytes
SHA-256: 948d81bc3d5cd78962ca676b7d54ee0ed99e41d35948ee5678329efd642746ae
font_02_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1