Malicious PDF — malware analysis report

Static analysis result for SHA-256 a680203f9268d89a…

MALICIOUS

PDF

74.3 KB Created: 2020-11-18 01:39:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 26b58fac7bd99986ba128e12b2b9038d SHA-1: 91e56d287b3980ee901de7a0d881e4142d384508 SHA-256: a680203f9268d89a481c14d6bac3d9df5d541f476a72de1b13a9cba7748fe419
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 pointing to Weebly and other hosting services, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malicious redirection attempt, likely leveraging embedded JavaScript for execution. The primary IOCs are the external URLs used in the link farm.

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://trafftec.ru/123?utm_term=apa+correlation+table+example PDF link annotation
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/3401018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_5f9de93dae2bf.pdfIn PDF document text
    • https://vodemiteju.weebly.com/uploads/1/3/4/7/134722100/5366412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_5fb2746fc935c.pdfIn PDF document text
    • https://rupunapu.weebly.com/uploads/1/3/4/3/134354814/05b7e95d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415527/normal_5fa5fe36dfba9.pdfIn PDF document text
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/leratu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5f8de5e01adbd.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/189a8776-095f-4d21-9073-f42f374508f0/chitram_telugu_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/holt_handbook_second_course_answer_key_chapter_5.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/abbreviated_injury_scale_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/lavezex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd48f81-1580-424d-b0aa-cb79d5745062/54019605454.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_off0000ce4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4E 4888 bytes
SHA-256: 7e9086d8f9b1dc968f1d034be40cdb4dbec1b610094596a81e654209fdbcaa97
font_01_sfnt_off0000dec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 14932 bytes
SHA-256: 2205f7ffe7998c3a62dca521d9ee47dd74d2eee1fc2d83c35d253feb7a4386ef
font_02_sfnt_off00010e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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