Malicious PDF — malware analysis report

Static analysis result for SHA-256 9697d89768ff052b…

MALICIOUS

PDF

68.0 KB Created: 2021-09-28 02:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31a2de945b81b340ab8e4741c9a5cc79 SHA-1: 47d9cab1b9f3aede57b0e28114123a481f9a37ec SHA-256: 9697d89768ff052bc4fd43a3d8e7103d9d7d17ab7ed1f61e31055c535a13da9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.andreapondika.cz/file/94960509550.pdf In PDF document text
    • http://nessium.net/userfiles/file/samedaduxa.pdfIn PDF document text
    • http://jawarakreasi.com/file/50671850212.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/pixomegekoposokasi.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/vekulivuwu.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/66028663862.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/dojetilotoxemom.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/55826416308.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/fowugonozikamem.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/1972919116.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/pivegurexojejos.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/75640484536.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/83950402018.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/delojenujuwopud.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/62072897742.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/bibumatanuda.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/lazixesedoxemarobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=d%26d+4e+heroes+of+the+fallen+lands+pdfPDF 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_off0000ab55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB55 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000bdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF6 18072 bytes
SHA-256: 4bdb96421e4d1e1037c211ece3da2f9301d2c30dc35b3a9add5aedae2c3dc628
font_02_sfnt_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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