Malicious PDF — malware analysis report

Static analysis result for SHA-256 59492a6761390588…

MALICIOUS

PDF

81.4 KB Created: 2021-05-24 21:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0470ad9e17b0c678ae12afbd4263a519 SHA-1: 4c871e745ae7f8d09ee9f4d8b8e0100655cbfcec SHA-256: 59492a6761390588516a9af0ed8340f56ef4e4d4ac93e5bd6f9e080aabc6bc66
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'link farm' by heuristics. The primary URL, 'https://resalured.ru/strik?utm_term=libros+clarence+larkin+pdf', suggests a potential phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

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://resalured.ru/strik?utm_term=libros+clarence+larkin+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417207/normal_600d60261872a.pdfIn PDF document text
    • https://vugesajovor.weebly.com/uploads/1/3/4/2/134265649/4610369.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404113/normal_5fee9c33a7d63.pdfIn PDF document text
    • https://vikuwavek.weebly.com/uploads/1/3/4/5/134506456/159d1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_600dc34bb5e65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447278/normal_5fc5fdbb7a893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458145/normal_6013c2a5d1051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424043/normal_60279b08ba33d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_602d27d5cd3e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427799/normal_5fd7d75eb97e3.pdfIn PDF document text
    • https://panonalosisewe.weebly.com/uploads/1/3/5/3/135316392/5819057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_6025f7a5b7399.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482631/normal_5ffd2e1f2f61f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459645/normal_604057725a3a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379613/normal_5fdd69b658473.pdfIn PDF document text
    • https://gazumewus.weebly.com/uploads/1/3/4/9/134901575/bemipirulepawumenira.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7a14b822-d0c7-4364-a361-0a31bb7affb3/papuwaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50782046-d583-4b7b-a9e7-e219d797f983/math_makes_sense_grade_4_homework_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1cd7386-ef7d-461d-a4c0-2222f4ae47e3/free_android_music_download_website.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 5000 bytes
SHA-256: 1d78e47499d796d61db82b4363ea57d0aa511b4d84e590b91cfc36dade5df151
font_01_sfnt_off000100ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 12620 bytes
SHA-256: 55c01895d79d34d3343a934e6bc4628fb5b4b1dec3bd44d1502235761320cbfa
font_02_sfnt_off000128df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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