Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6152abb154d1bf…

MALICIOUS

PDF

84.9 KB Created: 2021-04-06 15:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fe0668594ff7575a2f61bf47c6e6e955 SHA-1: 37d4b78912374aa26468bdc10ee89be354b3036d SHA-256: fb6152abb154d1bfb64ac0484d21063e857e443f5149d1ed5ede045035054fdb
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://baarspo.ru/strik?utm_term=why+you+didn%2527t+go+to+school+today PDF link annotation
    • http://form-lnstagramverifiedbadges.com/5057274550535j3z.pdfIn PDF document text
    • http://zujuzerawijuk.medianewsonline.com/75964241265.pdfIn PDF document text
    • http://allostar.buzz/17278643726w9ila.pdfIn PDF document text
    • http://idealslimitalia-official.site/sisasewubolyt8qm.pdfIn PDF document text
    • http://bupimobim.sportsontheweb.net/exercises_present_simple_negative.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/geradi/tolewewes.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/avengers_2_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/einaudi_nuvole_bianche_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/bowolajano.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/61870518628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d40e916e-f5a6-4aa5-ae0e-5a3dfa57d336/74943328518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853604ec-7b6a-457b-a15d-6e2cd1c77760/ronuvofopaxufazunoraj.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/99956458613.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_7ab3a9a467ab4fa8a81a5daa5cfca04e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/technical_support_vip_script._lua_apk.pdfIn PDF document text
    • https://3e206333-d6ff-4be5-a246-6289f7259d3b.filesusr.com/ugd/973a7d_fa7a8955b5e84ef0943e406129e9c5a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8461663c-5138-49a8-b529-7ba9187e149d/ap_seminar_tmp_rubric_2021.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_off00010e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 5252 bytes
SHA-256: d72964e2d78d509015ea650f64ed4a44ccd699e39abaf715635f547b290f6ee6
font_01_sfnt_off00012014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 11388 bytes
SHA-256: 84ff131dd12565f9ed53eaf8fbfe9a0f591709d1bad2573163093ff03e8c61f1

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