Malicious PDF — malware analysis report

Static analysis result for SHA-256 327731d537a69fdf…

MALICIOUS

PDF

80.5 KB Created: 2020-12-24 21:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 66c1a4df17b16b8e706b4026609ce0e5 SHA-1: d4e78b6b857ce37b322ae3c3297f77211627c619 SHA-256: 327731d537a69fdf3358f788fa1882111a78c7e47331aa8a1f9b305b197c06ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains and appear to be part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

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://trafffe.ru/aws?utm_term=where+does+sqlite+store+data+in+android PDF link annotation
    • https://wuxemarujixad.weebly.com/uploads/1/3/4/7/134709263/vevexinujepifas-pikikuxu-zojoren-diwer.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/jajeTg7/cheat_gta_v_pc_indonesia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_5fd7ef7865e57.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/a75755.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/6Tijepc/5707522704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_5fc034e59c271.pdfIn PDF document text
    • https://cdn.sqhk.co/xizowabik/gffIjg3/viderubori.pdfIn PDF document text
    • https://suzotavuni.weebly.com/uploads/1/3/4/7/134765747/8364465.pdfIn PDF document text
    • https://cdn.sqhk.co/pitewomepe/jd0gsif/walabapigumixux.pdfIn PDF document text
    • https://pixovifovefesuv.weebly.com/uploads/1/3/4/6/134626719/sijixixanomosej_xepobikowidazuk_paxurobenevet_zevoxi.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/kotodur/72824843174.pdfIn PDF document text
    • https://s3.amazonaws.com/gajejasa/87182144645.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 5052 bytes
SHA-256: 2da41a579bcfa7be19443cc7458af2d172fd0234d9a5d5db6ca478cf371bf266
font_01_sfnt_off000103d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 11728 bytes
SHA-256: e55733d3eec423e2bd413564e4855e08513ea70472a4aa716cd446da69728c52

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