Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b81334c2efd0d5f…

MALICIOUS

PDF

67.9 KB Created: 2020-11-24 13:34:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e51287f3878a21174fc1398b27890109 SHA-1: 99347e6286f48666cffd97645ee45bae74bc30d6 SHA-256: 2b81334c2efd0d5f13ca19e4c5bf7134ee0ec680acaf25a2d444e296771ef80e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious URL that appears to be part of a link farm designed to boost search engine rankings. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=calculo+de+pendiente+de+una+rampa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408596/normal_5f9d2f73324db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5fa491652717f.pdfIn PDF document text
    • https://lemuladi.weebly.com/uploads/1/3/4/3/134316580/sumomomomexeb.pdfIn PDF document text
    • https://purolejomi.weebly.com/uploads/1/3/0/7/130776639/zopuruvejugi_lapige_tabij_kevipuwuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f8bed9eaf58e.pdfIn PDF document text
    • https://kusopexel.weebly.com/uploads/1/3/4/5/134526262/8667330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5fb88aa8a4faf.pdfIn PDF document text
    • https://sijerixo.weebly.com/uploads/1/3/4/0/134042725/gifanodijolovew_vomibapa_wateb.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/jiguwuzobozobaz/multimodal_informational_text_powerpoint_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/nujosuwemedadi/wilogutexivoge.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/dowovemif.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/24864055483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b7d45a-c2ea-4e9b-aa8e-136d314dcde9/nikejumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da20d9d6-30dc-45ca-93b9-fb74d6b01a49/practica_de_sumador_y_restador_de_4_bits.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/dolufexavozomibufuget.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_off0000ca40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA40 4948 bytes
SHA-256: 35ec4c5f611218600d6347ab85c685412f74f6c3b0bb87f6a526d745b6e83a2a
font_01_sfnt_off0000dafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 11660 bytes
SHA-256: cf7bf766b716a70e3dc914d0ec0f96b643a2181fcd89c9fcecabdd3c0cfd60be

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