Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed37528a078cc8d6…

MALICIOUS

PDF

77.9 KB Created: 2021-03-09 22:28:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2b04aef88700d98419b85efbdc64e925 SHA-1: 9e0318e417197915120f7025140fc1f05ae6d87c SHA-256: ed37528a078cc8d63648adcafb06cb8a8d9a1238f1849562abcf76e011d921a1
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-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://zajinet.ru/123?utm_term=best+break+dance+song PDF link annotation
    • https://vukuxonujifated.weebly.com/uploads/1/3/1/1/131164545/444b2.pdfIn PDF document text
    • https://divupamafotot.weebly.com/uploads/1/3/0/7/130739309/kikixibasix.pdfIn PDF document text
    • https://napufifibadabe.weebly.com/uploads/1/3/1/4/131406817/xopitu.pdfIn PDF document text
    • https://zupufirelerige.weebly.com/uploads/1/3/0/9/130969681/fafinu-xidikezet.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/tetofamuxulil/dark_lover_plot_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/dugafasot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bddc71-b9b9-4cf7-bbbf-a9d4ad5d6207/exerpeutic_900xl_recumbent_exercise_bike_with_pulse_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/16138754929.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/completing_the_square_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/97691869779.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/wordpress_user_role_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/dowizimewurukawesolirorip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0796c8dd-07bb-49c5-9ab1-61c47b62bf17/how_to_fold_paper_storage_box.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/84960684361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92c5ed71-b145-4056-9b1a-d8ed63d4e5ca/diary_of_a_wimpy_kid_wrecking_ball_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/botepoxosivu.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/mi_vida_loca_episode_5_answers.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_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 5328 bytes
SHA-256: 55a50a559a252f2e1d93c06e20ebbf2da22e021dfa1175494b2671897c493d5c
font_01_sfnt_off000107b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 10240 bytes
SHA-256: 856e71e595c43b0942cdc219d1da5e26eac305e8fa5c678fcd92014578f469af

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