Malicious PDF — malware analysis report

Static analysis result for SHA-256 609aa2bdbd50df93…

MALICIOUS

PDF

74.4 KB Created: 2021-02-24 15:08:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 93a0fe6a79aa4ce35f2797b51577a9f9 SHA-1: 8c22fd85839abdedbc6c35f870463e7b953285dd SHA-256: 609aa2bdbd50df9396fede74796107889ef41d4c7163920d345afbda192576bd
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, with one prominent example being a link to 'jottigo.ru'. This suggests the document's primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=this+is+amazing+grace+chords PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365539/normal_6031cd8d16b33.pdfIn PDF document text
    • https://tajolakafu.weebly.com/uploads/1/3/1/4/131454466/3181055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5fd2cb487bc93.pdfIn PDF document text
    • http://ig-mediateam.net/pujaranemimadonnyp5.pdfIn PDF document text
    • https://jigazukenu.weebly.com/uploads/1/3/5/9/135964778/4943858.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/lamajukerepazosevawenufkinp1.pdfIn PDF document text
    • http://tells.fun/208220848930dfo0.pdfIn PDF document text
    • http://glasshookahcatering.com/75297656052ub1nv.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/resabomibogodaw/blacksmithing_leveling_guide_wotlk.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/83142359654.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/dasawidorukemetipi.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/cet_delhi_2019_admit_card.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/website_to_korean_movies_quora.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/2004_cadillac_xlr_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/panepamawatujabalilati.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_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 5320 bytes
SHA-256: 77403f7f4bb25649a093a7a8035ee2146cc8d987b40df1c3cf4544cc45b47abb
font_01_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 10740 bytes
SHA-256: bcc6a59534a66682880a52f6697e8df09a13c7ce36a4138c19083eb72352c01d

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