Malicious PDF — malware analysis report

Static analysis result for SHA-256 e829ef62e2059876…

MALICIOUS

PDF

73.1 KB Created: 2021-01-11 21:33:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8b8ba09938a0432df2e2358e2827bdf4 SHA-1: 7e14f967dcf0c974b1c63f6451ef7ca17cc433c3 SHA-256: e829ef62e205987636d60375b2fb7ead9d41bf80a63e0a9c2f40f726c69c5d94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a phishing or spamming campaign. The embedded URLs point to various domains, some of which are hosted on platforms like Weebly and Amazon S3, indicating a potential distribution network for malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafftec.ru/123?utm_term=nand+implementation+of+or+gate PDF link annotation
    • https://site-1172602.mozfiles.com/files/1172602/best_telehealth_services_for_mental_health.pdfIn PDF document text
    • https://fewurigog.weebly.com/uploads/1/3/0/9/130969621/6863349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375086/normal_5f8e6da5b2ad3.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/rumekovuba.pdfIn PDF document text
    • https://pufinixebajev.weebly.com/uploads/1/3/0/8/130873949/c6e71222f.pdfIn PDF document text
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/sizakabat-nefagexusufefar.pdfIn PDF document text
    • https://bukowimulo.weebly.com/uploads/1/3/1/4/131407836/1104fb8361.pdfIn PDF document text
    • https://sujanumijixedi.weebly.com/uploads/1/3/4/5/134501714/pamefarof.pdfIn PDF document text
    • https://site-1168078.mozfiles.com/files/1168078/kuzukodoriziwopexuxiwuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sesijesule/23519581293.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/64843331149.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/kegalozulutenokikip.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/csr_racing_2_apk_download_android.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://scripts.sil.org/OFLIn 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_off0000cb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 5152 bytes
SHA-256: 8206bce4194d722e0f0075ca67ee4a9f891bf2a013556193152607eec7c1cc8f
font_01_sfnt_off0000dd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 10984 bytes
SHA-256: 90fcafaddc6757c425ad765c5e0003f4e6291c47261954bd0d61bb2959221d81
font_02_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 16076 bytes
SHA-256: 5617ec9627a8ab3ec6258a90d9208e20427de2a6b8b5195bb6b34d6d8d69fe18

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