Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1aaf8bc701eb5b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 02:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c8881b55843efc50f39c33b65c1759d SHA-1: 288917c1fe1a1b513c2e43f3137360d5a7dcc560 SHA-256: bc1aaf8bc701eb5b9e78e80e04ba76cd28cc2bc7f162b31013b93819a1228b6b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/xewoligiga.pdf In PDF document text
    • http://phunggia.biz/userfiles/file/tusewodorijotivus.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/sewokenegafa.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/6937d55c5d79d191bd9bf29d5af7e797/mizenawevadirabagoxix.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/tuzapoxetizosu.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/55870436716.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210904_233253.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/55426858457.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/finogulopurek.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/vasaroxilebotovekodel.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/xumamar.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/85926995790.pdfIn PDF document text
    • https://o-dance.com/upload/files/pesasopuba.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/53521943978.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/pamojuzusimisafiresele.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/fevofexasazajokix.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/sunuzusakemaf.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/dasevufotuborukowiledere.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/91843082533.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137adfd80fad---sezesavukulumipadoriko.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/zixekumebufepagarimuzi.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/33336825852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=share+location+between+android+and+iphonePDF 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_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 10744 bytes
SHA-256: c88e8ac2031360d665cfbc79df6a97d7351dbeb369b35f8b51238e7ffcc8e5e1
font_01_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 17632 bytes
SHA-256: 6bc995b73852b00201f6a01ca8bd3847fe75d48ff360bb3a3d0b8476d3d008f0
font_02_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1