Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1881e056cd0c349…

MALICIOUS

PDF

71.7 KB Created: 2021-02-25 13:55:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 71bd35be51ca3b5bf310c6456caf610c SHA-1: f93ab14e9391d291b901f432b022b012c4470d3a SHA-256: d1881e056cd0c3491fc2763b523dfa7d9ac6a5ed69311acfa1ced8b189baf1ae
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a large 'link farm' likely intended for SEO manipulation or to host further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest it is designed to redirect users to potentially harmful sites, possibly as part of a phishing or malware distribution scheme.

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/wix?keyword=propiedades+fisicas+de+la+materia+organica PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459805/normal_60301cdf82c0f.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/Vgjjf24/ates_ve_su_6_oyna_sabah_oyun.pdfIn PDF document text
    • https://voxipomawo.weebly.com/uploads/1/3/1/3/131379395/mawurafisajirozewad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422390/normal_5ff0cc338a4f4.pdfIn PDF document text
    • https://nupafosudivoz.weebly.com/uploads/1/3/2/6/132682156/balorebokote.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/jajiJjg/16012380157.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/KTOCiiA/salufujugorasazaratam.pdfIn PDF document text
    • http://losqutoq.online/fokupomovenevepxn5yr.pdfIn PDF document text
    • https://redojakora.weebly.com/uploads/1/3/2/6/132682723/2737433.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/wazorixekunafob/rekisikilo.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/fekobikotesagi.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/14629125245.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/ncb_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/guideline_central_app.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_off0000d7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 5476 bytes
SHA-256: c1c948194ab0076ea2943754c0acde5e1b0995f32b7778c185b78e118ef39291
font_01_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 11456 bytes
SHA-256: c68092fca1d78208852c5a625f5db79f62d60b2c2f54cb638b6990aa11987816

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