Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f00915fca8bc5c8…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 02:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e615d53055c54b1ae2d61e5a7e27c8ee SHA-1: 99d52b83e9a9f17a19939cf5075fdf11f166036c SHA-256: 7f00915fca8bc5c8308f6968ebbe40f5ed6b1c9f922feefd6216165cf1df3948
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or spam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates that the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=how+to+print+comments+from+pdf PDF link annotation
    • http://etspak.com/survey/userfiles/files/57316816185.pdfIn PDF document text
    • http://nessium.net/userfiles/file/kusaj.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/97605335305.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210923013825158.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/girisu.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/46613377733.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/sazinev.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/pozifubenagej.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/mijewexixu.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lopavokaliletimiwinemi.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/mosarofopexununodewu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/117b479a6c6e059f82e23503d13edc0c/20176184465.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/webotefa.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/3463999973.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/54748256133.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/83928947067.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7619324295.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/vonuzuzoxosogenedot.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/80417193738.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/94016483321.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/57991645392.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_off0000aca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA1 10652 bytes
SHA-256: dcc6044bcea186f9197f42f3f0e2c6ec8ab74c0a2428b3166ac412da4418df65
font_01_sfnt_off0000c508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 15796 bytes
SHA-256: 0831647c41fe423ad47ad160ab5f4ba3eb7d26a4e37a373cc9cd3b7ee8da00e2

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