Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd45e3035d7db2b…

MALICIOUS

PDF

90.2 KB Created: 2021-09-16 17:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9451ecc15161101e75a989a065637432 SHA-1: e571c195d06ce84752fad6a05c5a91ea1503e146 SHA-256: 2dd45e3035d7db2b4459d6ceb3a8a2a6038d39bdf9b5c99c3cc5abeaaf9bf798
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one heuristic specifically identifying a link to an algorithmically-generated URL on potentially disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://tiszaladany.hu/upload/file/bujepiv.pdf In PDF document text
    • https://manualismedicina.hu/fileok/file/89085604623.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/ruwap.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/77028376022.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/66275044737.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/50292709797.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/rupiwobotidokufozavifasam.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/vadupusu.pdfIn PDF document text
    • http://video-cycling.de/files/file/lijatatapife.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/gitinokutopaxarikezelo.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/gasikorubizo.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210914054657352767943.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/40721561500.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/fodazemawafigoko.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/6275967256.pdfIn PDF document text
    • https://filetorme.com/upload/files/6103414965.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a35b24048e---zipenolozajan.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/30858217545.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/78778977982.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/79341043062.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/diwulaletozidojazo.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/72573871554.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ncmkofjqiv2qlh2olmdhq156d1/41539546809.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/43474083661.pdfIn PDF document text
    • http://innotack.com/userfiles/file/fawawada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=love+simon+123moviesPDF 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_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 19452 bytes
SHA-256: 0ab503e8b2e06bbb8c525f26af64279eef884bc3df7ab68ec80e370ea506ac27
font_01_sfnt_off00012caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAF 10228 bytes
SHA-256: db5fb1796d9053736908c2ea93494640f6c780ae449fecc16ea7fcc2e0a03213
font_02_sfnt_off000143be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1