Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a41c4e77c6a7b2…

MALICIOUS

PDF

108.4 KB Created: 2021-05-21 12:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bcecc4462ad1396fde6898ca7995481a SHA-1: 7eef7b761d0ada74e6a17127a4a65bed08730845 SHA-256: 35a41c4e77c6a7b24f9c59de847f3ee78398877358e9a89cfd27b991f8481232
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The embedded URLs and the document's structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=catalogo+amway+2019+republica+dominicana+pdf PDF link annotation
    • https://volixezutepa.weebly.com/uploads/1/3/4/1/134131916/6f627f4da2.pdfIn PDF document text
    • https://gotanizanoga.weebly.com/uploads/1/3/5/3/135332446/c2bca361c.pdfIn PDF document text
    • https://gufovijer.weebly.com/uploads/1/3/5/3/135339237/5349539.pdfIn PDF document text
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/501ba48930.pdfIn PDF document text
    • https://galinigogazefu.weebly.com/uploads/1/3/2/6/132695851/juril.pdfIn PDF document text
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/8350285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_601f9bbf3ec49.pdfIn PDF document text
    • https://nifebupamej.weebly.com/uploads/1/3/1/6/131607321/nezasotogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_602f38ffb87d2.pdfIn PDF document text
    • https://femesavez.weebly.com/uploads/1/3/1/3/131383434/3966525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463308/normal_5fc7f8c091ea1.pdfIn PDF document text
    • https://maposege.weebly.com/uploads/1/3/1/3/131378999/dekitadoraterebaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_5fd1261c6fe7a.pdfIn PDF document text
    • https://zosonokabawim.weebly.com/uploads/1/3/4/3/134316026/wivev.pdfIn PDF document text
    • https://gewavidabu.weebly.com/uploads/1/3/0/7/130775927/9558921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_604639e3e9707.pdfIn PDF document text
    • https://raxugujelagad.weebly.com/uploads/1/3/4/1/134108814/076bce1bd0e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/daxemo/fill_in_the_blank_worksheets_1st_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/fudopujirekil.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/bangla_net_tv_app.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/nuzenutinugiwevaz.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_off00015176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15176 6016 bytes
SHA-256: 686a9ccbcffb2b8664c0bea0db0b08c26eccd54b0fcc62074823e6d9a7523696
font_01_sfnt_off000165f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F7 16012 bytes
SHA-256: ec5002936b97ea799f9ef9c5818a2697ded4ebae8c25b6e1d0400c0f86583e41
font_02_sfnt_off000195f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195F8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f