Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8dfd787d9f6ff4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 16:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c76fb8bbcf11142d5aa0e2a107d674a3 SHA-1: 756f71e24347d9ab99e3443e2dda50ef5a8a1f5d SHA-256: 1d8dfd787d9f6ff4b87eb80fc1176e5c0168f36a39ae8fd38851f83062925010
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ip-golubev.ru/ckfinder/userfiles/files/nikanulaveboworateje.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6pkul1ht25konaqd66mgmet8p6/tuwigigovot.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/21063011588.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/67155363645.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae406ddcdc---lijexitodimivolawokomiso.pdfIn PDF document text
    • https://greenways.at/userfiles/file/75326754090.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/87031793347.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/masuze.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/54717317583.pdfIn PDF document text
    • http://esistore.com/userfiles/file/54122289782.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/tizukewaforelezuvav.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/muzagibipegagulasal.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/34616206538.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/bigurukesufesopunawumab.pdfIn PDF document text
    • http://24cvety.ru/upload/files/kexozugudesu.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/78729387791.pdfIn PDF document text
    • https://successalpha.team/upload/files/kodomik.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/soralas.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-10/20210910191701295319.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/19575459583.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/36636965684.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/tekuwuvo.pdfIn PDF document text
    • https://papiratisk.cz/soubory/47111845545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=code+in+ro+ghoulPDF 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_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 10228 bytes
SHA-256: 979fb171aa09cf9df3d75e4042187ce5769b54563ee07b5a481db120d9164f03
font_02_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 19504 bytes
SHA-256: 75dc7ac943f95b560c8819a0492762b18bf89b0afb119200b0a2b93958bc20f2

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