Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64a9eb09f1ceba7…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 00:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ee331656a5e4fc9bf67ddcf38d1571e SHA-1: a56ee5f10e3c211fe47210ea6eb2ff066fceca89 SHA-256: c64a9eb09f1ceba7fb4bba71058e6c75182d2b93b5cadfc137cf4c832ca4b52a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded URLs suggest an attempt to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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.
  • 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://technocom.pl/editor/file/61490736608.pdf In PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/fajijixonizisalomowen.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2080a8846---89834708854.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/gujadanatiwenufefurox.pdfIn PDF document text
    • http://friulanapanini.com/images/file/55636331504.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/91105397079.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/nazemeliligabunumopo.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/wuwirig.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/pirexamixafumunusebuz.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/13774797306.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/paguvipovifop.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/diguvixajuxeran.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/58824799095.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091403322980554.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/76694061397.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/q5roefdofs299h8e644r62d490/51186072586.pdfIn PDF document text
    • https://advik.net/userfiles/file/46331783952.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/tejanuvobewiwosodimugava.pdfIn PDF document text
    • http://dr-temt.ru/images/file/bagajasevefa.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/20421351313.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/kopalasukadolusenagez.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/61134380844.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/famelexepi.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/wamidomexorabemozat.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/vepanojuworonotivudevoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=epic+heroes+war+shadow+and+stickman+mod+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_off0000b077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB077 10896 bytes
SHA-256: e6c86cabf25b3387c5a6019271c8e9807d3fe5c69c0cfa4f130e15b58a3b21f0
font_01_sfnt_off0000c993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC993 16116 bytes
SHA-256: 5335fc4480dcb8bdeba38f39b38405b9185cfd73e9cf8e88d163a05cc6ac2041
font_02_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1