Malicious PDF — malware analysis report

Static analysis result for SHA-256 99778170d7bc7711…

MALICIOUS

PDF

59.1 KB Created: 2020-12-22 12:02:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aef00268657856076842c6a46ba503bc SHA-1: 63423acd70989ebbea6d914895a3607be1e4efd1 SHA-256: 99778170d7bc7711a8b0ca009b653afc398591f15b0dc3b306c5dd802438fdb3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various weebly.com domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafffe.ru/strik?utm_term=brainpop+ell+videos PDF link annotation
    • https://tinutenuku.weebly.com/uploads/1/3/4/6/134664278/27c323dd496f3e.pdfIn PDF document text
    • https://nazizuvadonilu.weebly.com/uploads/1/3/4/5/134590702/bepumomebi_lugebeki_vamitonegotako_selutobinuse.pdfIn PDF document text
    • https://taxajefikudo.weebly.com/uploads/1/3/4/7/134765143/guvalovixulixelojuj.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/6261259.pdfIn PDF document text
    • https://pirovosarelivo.weebly.com/uploads/1/3/1/4/131406751/ca228b7.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/getizar/hempel_curing_agent_95370_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/assistive_technology_ndis_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/598de152-a2bc-4bc4-a241-db341256983a/30763457454.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/the_hunter_s_prayer_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82666d38-a562-4847-b801-05c18276e633/powileralovidevosefaro.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_off0000ac9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9E 5060 bytes
SHA-256: bc4419b444c7578adb3f48b4f1d8508a696fb5a8b21dc7aff19b0a8bb5bf03de
font_01_sfnt_off0000bde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE9 10104 bytes
SHA-256: 15a4a153504ab1f5f32e98b894d2bbdacb48266aaf87a1242b3914ff30c9ed51

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