Malicious PDF — malware analysis report

Static analysis result for SHA-256 b924fedd8e37318b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-18 20:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb7d60e6fd351c22c530f09e6f846173 SHA-1: d2c44472bdb616d0cb40cc93eadb3602a63b3da3 SHA-256: b924fedd8e37318b1ada24feeffaafdbd3185e1df50fd16cab6bd1f837afe773
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to domains flagged as link farms on disposable hosting. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of distributing malicious content through a network of compromised or low-reputation websites. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially malicious second-stage content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://fongyoskert.hu/userfiles/files/53160184130.pdf In PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/7950371233.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/foxojaf.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/87292732814.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/fixokejekaxalum.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/27129625384.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/dubufapupuje.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/83510996353.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/wefupisaxavefukitafanelil.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/99161686045.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/lumivabamiwadasezudokipu.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/lexusis.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21248107133.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/mewatabili.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/livotidobum.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/wezazonuwipefuzor.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/sojufibakulefopi.pdfIn PDF document text
    • https://granitnet.hu/editor_up/fefewikitexokazigigewuv.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451768c0576---bizapu.pdfIn PDF document text
    • http://afro-safari.com/upload/files/kekegibumoxad.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/45966516995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chromebook+set+homepagePDF 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_off0000af43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF43 15652 bytes
SHA-256: 47d79e51dfa30f95397a75c457ab1ed18f0a292aaae1f44791d21c4fad3ed762
font_01_sfnt_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 10720 bytes
SHA-256: ba84ed0dba251359cc9efc644e347b84e2a2581fc10ab7a3d2e849dff06f500f
font_02_sfnt_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1