Malicious PDF — malware analysis report

Static analysis result for SHA-256 528c723cd6dbbc29…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 01:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af0311d0015a8dcf31064db10d5171be SHA-1: 7531c23eb29dd72fb1e4964f921f0ec10771260b SHA-256: 528c723cd6dbbc298d642cdbab8870ef22fa9acc6d00449f2eb646cdb854bb31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and embedded URLs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8847e2363---23202516430.pdf In PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/82576041234.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/921375543.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/xamavure.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091521502293.pdfIn PDF document text
    • https://eguiders.com/uploads/betonizupu.pdfIn PDF document text
    • https://pratham.one/file/jajuzewamenopepanemupobo.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/74135541969.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/14260825611.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/wixoxuzufowabulej.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/19728553442.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/peduxukofupugasi.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/48127899971.pdfIn PDF document text
    • https://salwangurugram.com/files/jesupabe.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/wajigikeneforusofawape.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/wuvom.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/xijomidasoli.pdfIn PDF document text
    • https://inks.bg/userfiles/file/12797976446.pdfIn PDF document text
    • http://polipack.ru/content/file/87187587040.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/mekolivol.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/17133445576.pdfIn PDF document text
    • https://schmitz.cz/res/file/83154140677.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/44760128670.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/22437201916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tecnicas+de+coccion+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_off0000de36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 10332 bytes
SHA-256: 8045218fb2ab6142f989c020e9dbc7523c5ce8d1d35dfd73e373c0fb60532e1d
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 18308 bytes
SHA-256: 5242312c2adcfc207bcdbc3dd36753c3d61e7127226a0186b9891fe6fec917f8

Open this report in the interactive analyzer, or submit your own file for analysis.