Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e338d4bdb052be…

MALICIOUS

PDF

67.1 KB Created: 2021-09-24 15:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 817385a00246fcd28177f34491f6fe1f SHA-1: bd23d9bfabd2084afc92148c0f2ef92fc45ab9dd SHA-256: a8e338d4bdb052be2ca42bb29b367f59dd60e61958e54b3cfa8e5362c094ff55
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing an image-only design with a clickable link to a suspicious URL. The embedded JavaScript and numerous external links, including one to 'ambulatorioveterinariosanfrancesco.com', suggest an attempt to redirect the user to a malicious site or download a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=xoxo+cherish+apk PDF link annotation
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/116fb98da9759cc2993ecd3c2a3d8a6d/59259923800.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/62231367459.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614d553ccf0ab---kixemepepuk.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/2950586209.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/zibapatubagojobe.pdfIn PDF document text
    • https://diphong.com/uploads/zizasoninurivejotoxax.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210906_135135.pdfIn PDF document text
    • https://cet.sk/res/file/wopegavamufuziveminoxo.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/tibilajukidumivujilokan.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/77353662859.pdfIn PDF document text
    • http://thaifilmind.com/upload/files/98963196292.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/wumezofofosavurivikir.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/19311632367.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/notutakovis.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/lazomazamasavi.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/81463696171.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/ligazewizofaju.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/45214564700.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/93480777590.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/dobidosugu.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/pudijemudet.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/bapekovafewuxubuja.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/sodene.pdfIn PDF document text
    • 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_off0000acba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CC 14032 bytes
SHA-256: d563fa5c875164b6be23434d34b736cb9c5d789a44d9b10312fab98cebe77c33
font_02_sfnt_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 10424 bytes
SHA-256: 839a7643341e6c5287519b7d99d4438a031bb72a173534c444825fb5631222c6

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