Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a33c9f071d553a7…

MALICIOUS

PDF

75.4 KB Created: 2021-06-01 03:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c70233ac3a9ca9263f732b7f919a076 SHA-1: 23114ee17032e662ed8537a022888f7a41b73f79 SHA-256: 5a33c9f071d553a70a5898f7ffec8c50c06b3f3ceeb24b6c0684e34d841556a7
164 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm designed to improve SEO for malicious content. The presence of a 'download' lure and ClamAV detection as 'Pdf.Phishing.Trojan' further indicates a phishing or malicious download attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/pbw?utm_term=mobg.io+survive+battle+royale+unblocked
    • https://zuwexonoporij.weebly.com/uploads/1/3/5/3/135317719/zenujikojaro.pdf
    • https://dojovirofolabi.weebly.com/uploads/1/3/1/0/131069789/bivemixemas.pdf
    • https://cdn-cms.f-static.net/uploads/4383923/normal_606783128bedc.pdf
    • https://sujanumijixedi.weebly.com/uploads/1/3/4/5/134501714/segavega-lovexiru-xomobe-vamujukuso.pdf
    • https://cdn-cms.f-static.net/uploads/4365552/normal_6023f90b3ab74.pdf
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5fdba906f264d.pdf
    • https://static.s123-cdn-static.com/uploads/4391624/normal_5fee0bec02c93.pdf
    • https://mefupawex.weebly.com/uploads/1/3/4/3/134317460/nurusidamu.pdf
    • https://static.s123-cdn-static.com/uploads/4465707/normal_600754e090c22.pdf
    • https://mudasolujo.weebly.com/uploads/1/3/4/8/134886274/mebifemevidizin.pdf
    • https://wafubimuzev.weebly.com/uploads/1/3/4/8/134869603/201c1.pdf
    • https://static.s123-cdn-static-d.com/uploads/4450876/normal_60b05b2b5c351.pdf
    • https://fezadegijowazon.weebly.com/uploads/1/3/4/0/134096780/2490751.pdf
    • https://nulupuro.weebly.com/uploads/1/3/4/5/134596779/9741330.pdf
    • https://kaxubivor.weebly.com/uploads/1/3/4/0/134097794/93bcc18e4d3c1ee.pdf
    • https://cdn-cms.f-static.net/uploads/4377663/normal_60285a6ddf1a0.pdf
    • https://petomikerip.weebly.com/uploads/1/3/2/3/132303099/201dcdf.pdf
    • https://static.s123-cdn-static.com/uploads/4413696/normal_5ff85be2c19cf.pdf
    • https://litunuvojiv.weebly.com/uploads/1/3/0/9/130969221/c9b959600d8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a206a454-a81a-423b-bbdd-c66311292c4e/bhu_mca_entrance_exam_question_paper_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/b00e0646-1cd5-450e-aaba-35423500f9e2/movimiento_rectilineo_variado_concepto.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_off0000e0c7.bin
4c867d36d1a79d7eb229ec7537dab92b8e9acee5027b2fa68db41c07b888e372
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 5512 bytes
font_01_sfnt_off0000f3b3.bin
344993e7ace0279d2920a8d06b272e4cdb6705cfa3e0af8c6580e5f9172d766c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 13976 bytes