Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf955dcd19687df…

MALICIOUS

PDF

78.4 KB Created: 2021-09-22 20:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 54a83eec43e2f30e47db4f8c0a5912bd SHA-1: 4f1c49f9043b765d580f8077614aea2d9a5da24b SHA-256: baf955dcd19687df70231b850ee339338c7c7702aa2cc96c7393286f11dacfef
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one identified as a link farm on disposable hosting and another pointing to an algorithmically-generated URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure and numerous external links suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lovesenergy.nl/file/jetuxezunemejidugisijol.pdf In PDF document text
    • http://studiofranzoni.eu/userfiles/files/3043311616.pdfIn PDF document text
    • http://mousike.it/img_ins/files/57920038399.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/wolewalidufegudowimow.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/mafakefalefogokozuk.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/47099838238.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/10574906492.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/zugigabejuritem.pdfIn PDF document text
    • https://12shio1.com/contents/files/vovokadowoxafajaga.pdfIn PDF document text
    • https://blokhol.com/upload/files/fukafafoxaxijiku.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/18637657079.pdfIn PDF document text
    • https://siroyensao.com/upload/files/tefaduvudukemo.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/94220739192.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/56096490531.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/66612956666.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/bajoxivujamizumivuwakapu.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/3741809755.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/fiwizofowilozeduxu.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/71127065250.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kewapojokuduzaxegiwin.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/raguxonem.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/29659225342.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/tewuwepid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+all+data+from+old+phone+to+new+phonePDF 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_off0000cfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 16796 bytes
SHA-256: d56d40ce43cbf23243f5e8191b9e81c48cae660ba734940bb719303f033a21f5
font_01_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 10760 bytes
SHA-256: 7a1426c9782a516f7646c767500565e663bed92269eda503a4c7827e2a7bc0a9