Malicious PDF — malware analysis report

Static analysis result for SHA-256 814fd1ada9e563a0…

MALICIOUS

PDF

70.6 KB Created: 2020-11-19 08:00:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 468df6cd33a9129f4d6f3bb831dc35bd SHA-1: 73c8a2d2bd6c14ea7a504e85c955da76966ed153 SHA-256: 814fd1ada9e563a042b27c82c75d11573fbb9effe5203354950a49da769c346f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to PDF files hosted on Weebly and other platforms, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external PDF links, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The embedded URLs likely serve to redirect users to malicious content or phishing sites, potentially downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/strik?utm_term=starting+out+with+c+++9th+edition+an
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/2a5b38eef3430.pdf
    • https://xonujofepip.weebly.com/uploads/1/3/4/3/134385468/cde809.pdf
    • https://jixisejilikabow.weebly.com/uploads/1/3/4/2/134265892/4848934.pdf
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5f8aeb3e26ad9.pdf
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5fa6742678a98.pdf
    • https://cdn-cms.f-static.net/uploads/4462976/normal_5fa4796aa2780.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/mukobuf.pdf
    • https://xigepeseforala.weebly.com/uploads/1/3/4/5/134508125/4131380.pdf
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/4589730.pdf
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5fb5c9acd2222.pdf
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/pekufejulenaperom.pdf
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f8f980e101f1.pdf
    • https://bawujepal.weebly.com/uploads/1/3/4/5/134515469/8cb0bf8490b.pdf
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/fogejurusape-polajowefuv-fivot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dadupawo/75779608532.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d632.bin
b4b307be219aa54234db94449b0cf78fd0f481bd9b8b299cf8d5cd399791e087
pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 5344 bytes
font_01_sfnt_off0000e86b.bin
e894dd33c363333dd28eb34f2198f3032d0a19439314c1225ba5253f7e06b386
pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 10940 bytes