Malicious PDF — malware analysis report

Static analysis result for SHA-256 95828909b792f2f6…

MALICIOUS

PDF

76.7 KB Created: 2021-09-26 18:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a0b51f2cff40c8fb039848b2ca61bade SHA-1: cb165629fd2bb6be8a9884ec04e701601b5fd0ee SHA-256: 95828909b792f2f677ac0fc527dbbba15b3830dff61a7e56195a614538839c05
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content or downloads. The presence of numerous external URIs and the PDF_RANDOM_URL_LINK heuristic indicate a strong intent to lead the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://decom.pro/admin/ckfinder/userfiles/files/bategirapawobeve.pdf In PDF document text
    • http://fmdscu.net/userfiles/file/93030817368.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148de6645165---29762458448.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/mejulupazanamik.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/mebafebipofuratutiru.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/lapuvowimigidowadulupe.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/34991853540.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/zexawujuzozuga.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/031354509103.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614c002390470---lamewusakefad.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/xobafatenapoli.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/10964671091.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/45369543118.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/89897422788.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/49601930164.pdfIn PDF document text
    • http://groupunsur2.com/contents/files/logaranozovuponutirifejit.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/97380835583.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6147B14E42CB4.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/letodoxugidukezozogo.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/10272641869.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/zanexapevitox.pdfIn PDF document text
    • https://digireg.lu/upload/32021312258.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/24998997611.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/visunaguzewuben.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=boruto+episode+205+englishPDF 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_off0000bf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6B 19204 bytes
SHA-256: 9551830d8f70cf1841ba258b6721c5ee89b2db1523b69b366b467fa935cf6dc6
font_01_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 11036 bytes
SHA-256: fe814d604ea510e2e78680dca214d1b36c3e0ca44adbb4a5eac0fdddb3cd10c1
font_02_sfnt_off00010b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1