Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb568b85b372a483…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 04:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18abfb73a683afc774e13d0d977c007c SHA-1: 4037c734479aec2d43b9e6227e413c43cea31c0d SHA-256: cb568b85b372a483ee9b4ca4ed4ea2135c2d6ea3f761b3ce7e0cc8b3ddc73b17
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting an attempt to obscure the final malicious destination. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hamasataccessories.com/userfiles/files/97271395448.pdf In PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/88945767966.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/80702174198.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/20169025947.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/nelatesinazola.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/89268837295.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/6248659325.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/53753075177.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/dikewedodaw.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/kevaledusilezonesu.pdfIn PDF document text
    • http://szm.hu/userfiles/file/kudoluzap.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/3626102206.pdfIn PDF document text
    • https://agermag.ro/mm/file/42263140555.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/vaguxowem.pdfIn PDF document text
    • https://spacio.hk/attachment/file/fajafesarikefifosumu.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/redutim.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/karilifivalawobut.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210908_054636.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210924_044738.pdfIn PDF document text
    • http://paradoxine.com/upload/files/95276535710.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/52272742131.pdfIn PDF document text
    • http://www.og2c.com/images/file/manefebuzaduvudolozedi.pdfIn PDF document text
    • http://deliver.cueicha.com/assets/upload/files/94487310133.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25072906647.pdfIn PDF document text
    • https://majubesar.org/contents/files/forivedajufutapelatagawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+ldoe+modPDF 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_off0000b252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB252 10036 bytes
SHA-256: 063192c539087244ca60c54744c4f7eb1c783d610dc14b9ccc5f8b18966b63b2
font_01_sfnt_off0000c89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 16336 bytes
SHA-256: ad52bd06cce434a76a648e104fbf53731f11b2d54b69451c2d33304435f07ad8

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