Malicious PDF — malware analysis report

Static analysis result for SHA-256 812a14752f14d1fb…

MALICIOUS

PDF

72.8 KB Created: 2020-12-20 07:34:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 550361e8d1a62257668ad7af995e567a SHA-1: b69bafb14d03adbbda932ccc76448ad1480b8e30 SHA-256: 812a14752f14d1fbc176e6f21bb55a0e6d870ff70ef5c6fdfbd57d24de38c8fb
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/bikasosukazutomure.pdf.
  • 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://traffnew.ru/strik?utm_term=norton+core+vs+bitdefender+box PDF link annotation
    • https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/bikasosukazutomure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_5faf0e5e1b5e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378165/normal_5f90a260ed3a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454809/normal_5fa21870969b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5fbede86f3e67.pdfIn PDF document text
    • https://jajonugofetafis.weebly.com/uploads/1/3/0/7/130776034/d6c2340f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5fdb6ebfd80bf.pdfIn PDF document text
    • https://zeginuvo.weebly.com/uploads/1/3/0/7/130775519/sedave.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc557d06609fd0ee7af108f/t/5fcc6606c00f007ceadf9a4f/1607230983832/16948835338.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/72875676356.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/nejeleguxajubefad.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/equivalent_fractions_1_3_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d8507c9-3871-4452-897e-37c80f30fcfe/kewaxiputokanesa.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_off0000cc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC35 5012 bytes
SHA-256: 27e6f980d0180b1294d562ffee5f1e8a07b495b674a7c4bf570062e7acc55d8f
font_01_sfnt_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 10348 bytes
SHA-256: 5b045e3c6f369def009d47337db3448c7d6ad4539801955523f9b2f28d3159a9
font_02_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2

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