Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8f353b91bfc12d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 04:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be5877a56c6fb6eb71b049475b2c6aea SHA-1: 25acb96a696ac0a45bf9ebaa8bf934e7679ab6e8 SHA-256: 1a8f353b91bfc12d6d6ef434b87c80f7c80d9fca7fc67f583e55577c9552d038
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to various domains, many of which appear to be disposable or low-reputation hosting. This behavior, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=android+retrofit+post+json+example+kotlin
    • http://capitolmetrophysicaltherapy.com/files/files/98216990909.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/7140755594.pdf
    • http://microsolder.hu/userfiles/files/fegidi.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/puwulinanedaw.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/94120881118.pdf
    • http://scvumaichiramen.com/uploads/files/jebenatoxuwa.pdf
    • http://fluitec.fr/ressource/site-image/files/15902302232.pdf
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/wagifofijipibu.pdf
    • https://movingalpsfoundation.ch/userfiles/file/5217109168.pdf
    • http://sxhk365.com/uploads/file///vavute.pdf
    • https://tigaintan.com/contents/files/53492596735.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/re10him2okep8lnoru6u7peds5/77383714428.pdf
    • http://metrocars.london/survey/userfiles/files/34002163609.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/64975225226.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613244e43a5b0---18369051564.pdf
    • http://eprdel.cz/userfiles/file/ruvumozusuwag.pdf
    • https://gites-les-bardots.com/userfiles/file/pudedoxek.pdf
    • http://domusanna.it/userfiles/files/nusawa.pdf
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/ratozomavana.pdf
    • http://lifeline-sports.com/files/file/penulonugalupubi.pdf
    • http://tercovci.cz/files/file/jorojobokozibulonomajiwa.pdf
    • https://indianhairtransplant.com/ckfinder/userfiles/files/kezajonesinovok.pdf
    • https://webmakler.org/userfiles/file/segemamonujivazegizi.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/wewodudewupag.pdf
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/jaxulaxikukamopatan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c201.bin
3102547e9c1e78ff8b72fce6bc4653c62dba885dc7dca91fe35daf21e5462a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC201 10964 bytes
font_01_sfnt_off0000db67.bin
4126e03500f144c89627485edb8209b5ee8396ef58ac91abea036a6f16ae8bd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB67 17016 bytes
font_02_sfnt_off00010831.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 16792 bytes

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