Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9478728dfd0b4a…

MALICIOUS

PDF

66.4 KB Created: 2020-12-10 02:59:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d1c840d9d07d105aa4c209ca2bd01670 SHA-1: d89c0b0eba8b1f68c43e8430aca687ca6de87211 SHA-256: fc9478728dfd0b4addb4886f186a33b992038f7a8211e06a0fb6af5c749da91c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicating a link farm or redirection mechanism. The primary URL, 'https://trafffi.ru/123?utm_term=math+mountain+worksheets+2nd+grade', suggests a lure to disguise the malicious intent. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=math+mountain+worksheets+2nd+grade PDF link annotation
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/dogoxujegag_sunolur_kolip.pdfIn PDF document text
    • https://xosesobo.weebly.com/uploads/1/3/4/6/134697532/zatidovo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406456/normal_5fc680cd040b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5f9824562b4d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402718/normal_5fb5b797e906a.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/pukasojalu/vimisezetabozibajogutidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2d629d2-0591-4ecb-a83e-fd08a82b0ccb/bawiwifuvodekasebatudid.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/94831480846.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/najidafevaxoleximab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822e4e9c-2bca-4aae-aff0-70fc85af7f52/91664876066.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/7564350635.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/30938966705.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/favulojosegogirenex.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AD 5500 bytes
SHA-256: 0a373eb8b6b00dbe915529594ed484af951b1ac20a7216d41af17710a36eda15
font_01_sfnt_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 9792 bytes
SHA-256: 24eb2ad41f712f9bcc8c1c72109d87df180d3fb86f604286387227d7ec744fa3

Open this report in the interactive analyzer, or submit your own file for analysis.