Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7f8f97bde11bd9…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 12:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f632a523275b1499a2d182bb7b72369c SHA-1: b020ec807b5e1f47fe5a49ba9d9e5e971831e3af SHA-256: da7f8f97bde11bd9d28f99d435ac5e2eea918a10f1045103b1b2adf32dd23474
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://qlionshousing.ca/userfiles/file/zegut.pdf In PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/k0v8k4osdo1d9e3epdth4e7i0g/16349124115.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/68429850237.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/zipivexatetaruvoxiv.pdfIn PDF document text
    • https://suksesunited.com/contents/files/33921720979.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/15505327979.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/10002299081.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/86817889272.pdfIn PDF document text
    • http://tercovci.cz/files/file/44535204750.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/54838740185.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/67361696978.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/lotim.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/bireluse.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/89231982459.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210912071140_nxg8mn.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/30425371610.pdfIn PDF document text
    • http://hexindechem.com/upload/files/87797920704.pdfIn PDF document text
    • http://crediramasrl.it/public/file/75944155082.pdfIn PDF document text
    • https://baptistfriends.org/media/34037526323.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/karabep.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/33117846527.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/ninetibekudawefexuwipubol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=dream+league+soccer+classic+2015PDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/dozibefa.pdfIn PDF document text
    • 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_off0000b65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65D 17112 bytes
SHA-256: 95c6417862b5aa322fdcb248147b6e9abc4bb4ed8ba3327ca64edfd31de43020
font_01_sfnt_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 10900 bytes
SHA-256: d43e3f9a1335780f9ad550ffcb31d1c64e485691da7b39a03be28e827aedb81a
font_02_sfnt_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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