Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d593ca5f522e7aa…

MALICIOUS

PDF

83.2 KB Created: 2020-11-24 20:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e4181719b0b13394580d3ce723fe46a0 SHA-1: 980115da91a75ec196b7925663d9b3b8d76cd74b SHA-256: 5d593ca5f522e7aaba12acf3472468501a4561587f0d3c52674a3c62d5471fa5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafficel.ru/123?utm_term=reviewing+biology+the+living+environment+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485939/normal_5faa522729c62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_5fad69f28eecf.pdfIn PDF document text
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/dagejizunoz-resazasozig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446263/normal_5fabfaaeadf78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414688/normal_5fb5ce620cbf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408348/normal_5f9665fde8409.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/zesotat/fenusolikodizolozu.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/catacombs_of_priscilla.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/ssc_math_syllabus_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/savirufarenakevesojowaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/sovoxojigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d66dc4-4bb5-46b0-bd59-6f67a5c31309/13269770000.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/getogefon.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/96655693858.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/10287997101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286a3c39-aa1c-4b96-9641-e2908391b151/full_dive_vr_2018.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_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 5564 bytes
SHA-256: 2dffffe88433910eb4fca16f415463963c82d991dcffed5be9dd79cc320a95b2
font_01_sfnt_off000118f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 11528 bytes
SHA-256: c5a4d9a8d21b7763c3a75c48825f020f1d0431494fe4a5e3027cf53ddbb64232

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