Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea47fb8cc33469bb…

MALICIOUS

PDF

70.8 KB Created: 2021-10-01 11:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7e9a0ba8c5665b80a93a8e917c6a2a5c SHA-1: 6fe626f15965ec60eb635831c15288b00d1bca8f SHA-256: ea47fb8cc33469bb586c544a995015fd9e18dab7a84ffe61fed9fcdc1a08ff49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the sheer volume of external URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crysiq.ru/uplcv?utm_term=android+simulate+touch+event+programmatically PDF link annotation
    • https://nieruchomosciprzetargi.pl/files/file/kufiwukexazereguwajadi.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/21119741521.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/negamoxavolategob.pdfIn PDF document text
    • https://ycb.one/pro_pic/files/zuxutazo.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/81217846746.pdfIn PDF document text
    • http://stw-nowogard.pl/download/file/puxedowimikabikiwabujexad.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/58008622834.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/86343828774.pdfIn PDF document text
    • http://itagqatar.com/itag/file/files/terurarixuweb.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/kobomiwerogu.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/fetukofupufarobumeper.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/19170188032.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/4294793233.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/miniwakazalusopifu.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/65185052167.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b66c40001435938f20c41af14c3761fb/zidujurutekedujaxibugidum.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/94096314805.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b4bd616f7f88d4edbceec3624eeece6e/fukapimowodorabuxopave.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/78275901155.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/94327222639.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/71783214999.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/mobemabopezetum.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_off0000af2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73C 16688 bytes
SHA-256: 70e956a62d1f3ca38e85d708449f17e349150e61bf44e2c4dbab3e537c9d4b3b
font_02_sfnt_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 11220 bytes
SHA-256: 37a5bef5a9470c210bcc4bc1c39c3bdf34a4ff783fe4b3d5aeecb1d20916b551

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