Malicious PDF — malware analysis report

Static analysis result for SHA-256 49120fd4de874211…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 23:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b300095abafa924ab407be9f6d6f6b4 SHA-1: e83ea0d7ef4c861e73f73a9c55b479ba4a7c0537 SHA-256: 49120fd4de87421173894e01db88cc1fbd62a188cac29e6b0faf931e49fa2d17
106 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate maliciousness, with a high-confidence ML_NYX_PDF_MALICIOUS firing. The PDF contains a large number of external links, many hosted on disposable domains, which is characteristic of link farms or phishing lures designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous external URLs suggests a potential for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377fa0edf86---28280045528.pdf In PDF document text
    • http://cssh.es/img/file/getanoxijufejo.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/lemovijizej.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/50485494911.pdfIn PDF document text
    • http://unityproductions.com/upload/files/titojomaxidajakugatekaje.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/vazojurotitawexolupipesu.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/biduwes.pdfIn PDF document text
    • http://reopen911.info/media/file/15093727862.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/dumozoxowisumukexes.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/fofibaxuzivinadejukisaz.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/vedazetijuze.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/betobofaki.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210912235707_yvsprj.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/202194659226347.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/bolesemidor.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/laredojudoniseguxabij.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/kosinajurigapevodonaxu.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/rijemufigejiwometigimoxij.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/30677182405.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/58969775728.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/28190772533.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/wewibaxopijuwivukefatux.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/defulafewijoradapofiloga.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/90458927328.pdfIn PDF document text
    • http://harlit.com/upfiles/file/53452431413In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=telegram+network+problemPDF 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_off0000d8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 17552 bytes
SHA-256: 2e6363e760ad57c0e6131bca91254fc59cf1f021cb6d9e5c888e56fbf9331fe8
font_02_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 10616 bytes
SHA-256: ddcad4deae9b900fdd1a22cec857b9c9f38b946f0f91cfbd2589374695622616