Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86ccb65c33bdf4e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 15:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 79e2566d4d1be86f3ae53a6f55dca5cd SHA-1: 245fdd77206eecc95562814dc337ee3ebd1856e2 SHA-256: f86ccb65c33bdf4ef0ae1a9aba699b4ca782b68d6ba93b8fabb5936642d18db8
166 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, one of which is algorithmically generated and hosted on disposable infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a common phishing lure to download potentially malicious content.

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 https://internationallanguagenavigators.com/media/fabinakubujuwowusaja.pdf In PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/96950636044.pdfIn PDF document text
    • http://lagrupacio.cat/file/43722809071.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/wijiratup.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/jizoboretifasi.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/68120219165.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/fanimekosapituteju.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161421222a69d3---tiruretifebopudade.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614aea0713f0e---moted.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/mulufu.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/66969609510.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/33646815556.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/judifexekozegebivona.pdfIn PDF document text
    • http://husplaza.hu/editor_up/vorijagijadalani.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/degag.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/15752450149.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/povulimusepukopob.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/63799542527.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/88432462221.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/dijeloterodaxida.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/xusudamoworogosewiril.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/85459829638.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/tatikimenegusogoruseja.pdfIn PDF document text
    • https://subded.org/userfiles/file/xemanobopofijaketafuxo.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/zukim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+download+oreo+tv+appPDF 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_off0000b3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AE 16948 bytes
SHA-256: a87e0962b4321dbfecae85ed81c741f2e26304246dfbb053bb9d28f3afe481a5
font_01_sfnt_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 10268 bytes
SHA-256: 4dd2e6d13594b52cd48f216eabae8bf83345f85b01935530e22cf5760ddb4b9a