Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1073b2c4070a968…

MALICIOUS

PDF

67.8 KB Created: 2021-09-16 13:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70418d91b4d4d33d3193b12e1fe89d76 SHA-1: fef4f7cffbd9dac1f193c54d7e6750f0bd687193 SHA-256: f1073b2c4070a9685ec5280744fabd89d7d69125834d552075dd3ca05faaf246
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is a link farm on disposable hosting, with numerous embedded URLs pointing to other PDF files. While no scripts were directly extracted, the presence of external URIs and the link farm nature of the document indicate it's designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://leresto-niort.fr/images/userfiles/files/nawelon.pdf In PDF document text
    • http://cadelupo.it/userfiles/files/65847421967.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/kotozulolazutej.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/12701987261.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/49116170585.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/befuvevedemixez.pdfIn PDF document text
    • http://maihome.hu/admin1/file/vudiwunenupo.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/59793589348.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/51995346043.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210910060704.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/92064890583.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/71777467985.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/67873438777.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/vibotarenapar.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/49653747456.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/44167708802.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/5251907889.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210905_99DB476776D9EEE0.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/zexemedefasarorurixilipa.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/poxidutadilutaripo.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/bowumavawezunuw.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/86227088668.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/bavibepiwobuxefaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=utorrent+downloader+for+androidPDF 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_off0000ae81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC698 10272 bytes
SHA-256: 811fa32eb1f8d7f94d0755435465d06fc9fd363849bb548b74ab3d38a0b98758
font_02_sfnt_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 14392 bytes
SHA-256: c0f24e9230e1eb883044742fb537952998730f945310059ba879d02eb746ea14

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