Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1d7e4f00acdb92…

MALICIOUS

PDF

68.4 KB Created: 2021-10-01 11:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e25707ca58f4372f2436df1d87e103c6 SHA-1: 3fecb07034bd0a02c11661f23ec0ceb3684d33b9 SHA-256: fc1d7e4f00acdb92c71512eee4e8e0b0851a004eefa87e4dab1ca0064a7fc53a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=youtube+red+apk+free+download PDF link annotation
    • http://hingliltd.com/userfiles/pubafovav.pdfIn PDF document text
    • http://z500.si/files/wepalukexijire.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/tinewobojaju.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/nosukagunisubegesoxibina.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3eb89bc9---midilaruxopiragovos.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/8237869745.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/17625213866.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/jonoluxoneta.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/19457255661.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/morazixurezojifa.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/53651532777.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/gezironisoxame.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/zaragojogi.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/70385604327.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/45774899225.pdfIn PDF document text
    • http://iltorg.ru/upload/file/desam.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/bofomedefarolinok.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/29988566611.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/23592329537.pdfIn PDF document text
    • http://alvitraders.com/files/12225040007.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ugo0naecgto74nlsrcmse1er5v/vozemugifu.pdfIn PDF document text
    • http://geotersrl.it/file/zonijuluwoliramo.pdfIn PDF document text
    • http://petrduchek.com/files/97190960115.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_off0000ae82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE82 14616 bytes
SHA-256: a4efb15f5cc1f106ec239de7b7acb16f3c04471ff6fb368ab726050b9423036e
font_01_sfnt_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 10632 bytes
SHA-256: 1f492abf9688b4e06a50abdc57c33fb92632bc8c2dbe963a4f15f70bf622bf46
font_02_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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