Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7803f8c51788d7…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 06:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 587b13384164c82c87c5c81923867492 SHA-1: bc948dd6ebf1830d8755b4f408e82a60d5433322 SHA-256: 0a7803f8c51788d7ff193dbc287c05e27f697518f8ebc9db9393f3d619d5280a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous external URIs pointing to various domains, suggesting a link farm or redirection mechanism. The ML classifier also flagged it as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a phishing or malware distribution attempt, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://philabc.ru/uplcv?utm_term=calculating+volume+of+rectangular+prism+worksheet+answers PDF link annotation
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/kufusup.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/969a679852a82237e98fcae7509d863d/65608184327.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631240253541226565.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/64770542784.pdfIn PDF document text
    • https://cardolf.ro/files/45611823228.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/28540070976.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090919263080.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/73527545019.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/66708176923.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/37040972273.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090321455664.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/rodenazexebubelegotarumo.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/bifudujadezuwotivawexobew.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/zamoxagoxitulesexulav.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/88008746101.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/nopoganulojesamumosono.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/gewuguxetifirutelisuva.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5f0b6eadf---polofimudujixidixuj.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/39715618922.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/nometumofi.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/89703883550.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_off0000c67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67A 17692 bytes
SHA-256: 10403532a484e3aa256bcecae8759805c46d7b09aeff6d25501d219e8d8f6ade
font_01_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 11304 bytes
SHA-256: e55a84fd797c1a2f72824c21ff58d8c404b1bc81ded64a4327fce4b18db15135

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