Malicious PDF — malware analysis report

Static analysis result for SHA-256 68aa6ca74940ccb2…

MALICIOUS

PDF

75.7 KB Created: 2021-02-20 21:13:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c9b4dad86d580f359b68151ad8f16df4 SHA-1: 5cf6e00eb366c006da1ff9faf790c03946f5b99f SHA-256: 68aa6ca74940ccb22e61c5f7df7c870526c5e62329dba1c58653fb1625d90863
186 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. 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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=emotional+intelligence+2.0+book PDF link annotation
    • https://zonulezewuras.weebly.com/uploads/1/3/4/8/134890742/6757162.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382638/normal_60062bb3e8820.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/tewipemavevako.pdfIn PDF document text
    • https://pesowisigafu.weebly.com/uploads/1/3/0/7/130739627/6c9c829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_60125983a36e2.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/b5135ad40f19.pdfIn PDF document text
    • https://sawolopu.weebly.com/uploads/1/3/6/0/136049845/fenujiti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_601147b3b0152.pdfIn PDF document text
    • https://pamukisap.weebly.com/uploads/1/3/4/7/134761215/govukudawogigu-baxamizune.pdfIn PDF document text
    • http://zidujuwus.iblogger.org/job_application_form_template_word_free.pdfIn PDF document text
    • https://lasuzolus.weebly.com/uploads/1/3/5/3/135315371/binozazoxomudaj-zijaresenitore-selabidulajo.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/wuxajab_gejiwop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_601447357c4f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390996/normal_5ff22bb89692f.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/tokatefozude/wegirafisivu.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/buying_a_home_checklist_template.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_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 5312 bytes
SHA-256: e3c7d3dfdf3d44b071eec770cccec4d237a64bbdc5764335a0e7cde7a6828033
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 11960 bytes
SHA-256: ae4c8fe62f4694b97ebee94f277cc828618b95f130b652d296c2598f5ed79320

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