Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4add8ba7aa931f2…

MALICIOUS

PDF

59.0 KB Created: 2020-12-14 16:25:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2d823f79e0a0f1b93f5bc431049a776b SHA-1: b6c55622853d5f2bbc45882d3554e81a81ec8cb9 SHA-256: b4add8ba7aa931f27f3417c6401ab5ef525cdd0353ac2abdb4098eb5d86fc95c
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 0.9996

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/123?utm_term=metabo+angle+grinder+lowes PDF link annotation
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/78ffe7cd8fc998.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/bufipevuril/carson-_dellosa_cd-_4301_answer_key_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/25687203628.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/ronam.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/andre_3000_albums_free.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/arcane_legends_warrior_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/chirutha_audio_songs_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/256c7f0a-b0d0-4e82-b328-af9c26d575ca/2005_ethiopian_election_debate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dadf139b-e657-41bd-b5d6-b1d4dd678df6/death_of_a_salesman_biff_american_dream_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6cbf0b4-e44e-4341-872f-c1af3718424b/tagomefedokozerobetolam.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/rescind_meaning_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/spintires_full_game.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_off0000acc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC8 5232 bytes
SHA-256: b3386c9ba8308c7a52f79b39a709ba21bd05e7cb72dc4f546c59995fb3f5d80f
font_01_sfnt_off0000bebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBB 9576 bytes
SHA-256: 666c552391e16ff7e97ff63274d15fbfed0be0115d916821d3fabcc9f76771d0

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