Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55851ea4ecb4817…

MALICIOUS

PDF

78.7 KB Created: 2020-12-30 03:06:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2ab56e3494f084236d54d3f10cc92e1f SHA-1: 232a2fe7b1b011a1bcd4ebaef909f2ae40de0890 SHA-256: a55851ea4ecb4817bbf7e647029647c77347a50ab357e6306b2e371502b3f145
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 large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. 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 0.9995

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://trafftec.ru/strik?utm_term=class+management+strategies+for+kindergarten PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405930/normal_5fe065b2bb682.pdfIn PDF document text
    • https://cdn.sqhk.co/zawatilirip/y2O5gjb/mosawuxunipuj.pdfIn PDF document text
    • https://fubabogi.weebly.com/uploads/1/3/4/6/134617409/lepojalajaw_xiwuzala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/92c696b3-827e-4469-a4c4-526e9e2510ad/how_to_raise_my_daughter_s_self_esteem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34324d5-0b03-4a1d-b272-4b4a53dec73c/words_of_wisdom_for_police_officers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a1f86e0-383e-4572-9351-ece5236e44c7/moferikafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd74d71-0796-41bd-aaf9-1b25f61b57fd/werewolf_3d_printer_file.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/bapizoxilirifaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2e5686-6d7d-4340-9b2b-0da741fc77c3/quick_dirty_trick_pfsrd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e905c05a-2583-45c4-a59a-cfc6210f2354/sayoko_social_link.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_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 5196 bytes
SHA-256: 0341b058a5ca0dec67f30f05f4b20293173a6ee1351d95361c0561a800c6bfa0
font_01_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 10744 bytes
SHA-256: db25fc901a302de7f46346591dbc88131ffe259a421b700f7e2b0ad362fda50d

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