Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d50032cf70204aa…

MALICIOUS

PDF

95.4 KB Created: 2020-11-18 18:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 051503027ccbc7db915eab6623cdc810 SHA-1: dc6225320a75aef36c0cdf1bc0a92ec59564b513 SHA-256: 4d50032cf70204aa688af57bafb16451e2852c10e17d55215229456bd5d8eabb
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 0.9997

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://traffset.ru/strik?utm_term=tablas+de+vapor+sobrecalentado+del+r22 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446784/normal_5fafa15c03262.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/3ac78b13b13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403948/normal_5fa58c681afd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_5f934d95842ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_5fa6f1cc4b715.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/9410ad51-68e3-4f04-87e6-72adb258e11b/suxer.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/what_bonds_are_amino_acids_joined_together_by.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f509c3-21b9-4600-82d0-2f1041f7462f/cpc_practical_application_workbook_answers_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/inventory_spreadsheet_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/stuart_diamond_getting_more.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/solve_by_elimination_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/words_starting_with_chap.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_off00013702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13702 5348 bytes
SHA-256: ca85ccc21ba903e9d5646e762eb68944699345fdddc355f9d762abce9472a922
font_01_sfnt_off00014941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14941 11748 bytes
SHA-256: 3de4300b90767b676af6fdcdd4550ebc7f369137eb80733ba20646544261ef58

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