Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a12c5a86f03441…

MALICIOUS

PDF

89.4 KB Created: 2021-02-24 06:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 06f80c852f523f666ac4836c348f22df SHA-1: 056510e5a10edcf5f08b380d85681d69f063a6b4 SHA-256: 36a12c5a86f03441a6faed8eeb341fcacdcca1e744ccff0e990836b30ce6c74a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF_SEO_LINK_FARM heuristic. One of these links, https://jottigo.ru/strik?utm_term=sse+load+order, is directly referenced and likely serves as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests a potential for further malicious activity.

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=sse+load+order PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410191/normal_60153227c4535.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403948/normal_6007e12f82588.pdfIn PDF document text
    • https://nadaroxiwe.weebly.com/uploads/1/3/4/6/134688146/42541.pdfIn PDF document text
    • https://zelosadu.weebly.com/uploads/1/3/1/3/131379518/ae8881c90966.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/jixagibewarema.pdfIn PDF document text
    • https://vedoguru.weebly.com/uploads/1/3/1/3/131380953/sabuwamum-sukodiwu-rexab.pdfIn PDF document text
    • https://potijesidademut.weebly.com/uploads/1/3/4/3/134351663/detojigexoj.pdfIn PDF document text
    • https://tolojosokuriw.weebly.com/uploads/1/3/5/3/135326177/30ac8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wetizizokixo.epizy.com/gugig.pdfIn PDF document text
    • http://gevevutonixojub.epizy.com/borrower_slip_form_meaning.pdfIn PDF document text
    • http://xuvunemomot.epizy.com/coplanar_waveguide_resonator_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/kayarian_ng_pang_uri_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/vajowebawit.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/i_am_david_chapter_3.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/responsive_template_bootstrap_4.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/dasuwewe.pdfIn PDF document text
    • http://xabuvale.epizy.com/kirefutun.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/8262853163.pdfIn PDF document text
    • http://juvuzonowokogu.rf.gd/90885035299.pdfIn PDF document text
    • http://bixagolowetuf.rf.gd/65370479147.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_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 4920 bytes
SHA-256: 3151e75892de47cfd04b3c178375a2d711d253ef244a31548a649f4f6fe0f2ff
font_01_sfnt_off00013336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13336 10960 bytes
SHA-256: 7f5279dca600d6de6822f8a8948aedb7f71cbec130f7858013a72b16c0ee60e2

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