Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91f1cbf5cdc9fac…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 16:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c6ae957750ca89d5f524ec51b87cd13 SHA-1: 6ba62fd06c263c7fb0946ad8908f04cfef46b963 SHA-256: e91f1cbf5cdc9facb677e4422392e786193675990cd2f5ac7f47db38fc575d60
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to domains that appear to be part of a link farm or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://staractivecollection.com/resimler/site/files/35151284877.pdf In PDF document text
    • https://tavcam.com/upload/ckfinder/files/gubarek.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/75925302532.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/jakat.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/97839928388.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/26605812869.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/11492129529.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/nodetexogezaxaralito.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/62314292278.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/kuxezevuge.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/kogovibobuvenosu.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/vekutidi.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/gobumisi.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/35277700780.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109090010026982.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/dojazo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f20ab7092---47222718575.pdfIn PDF document text
    • https://oasis-travel.ro/files/20564398417.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/zepoxetilupoxodatis.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/wawuzur.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/79431497474.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161409279c7a78---sinarimixukadalebeg.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/tatugikugerami.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/vugowoworonemosebiwoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cannot+resolve+symbol+bundle+android+studioPDF 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_off0000b1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E8 10860 bytes
SHA-256: 32f93897e7fab33f95bff8718bbbc1af81ca34a93ec1da8dbd8c3470d923428c
font_01_sfnt_off0000cb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB06 15536 bytes
SHA-256: fddcddab166c2aa4514ad1ac02a1a6aa0dc07ef3eec127b6a96ed106f1033b87
font_02_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1