Malicious PDF — malware analysis report

Static analysis result for SHA-256 5670da2e979e6bd8…

MALICIOUS

PDF

76.1 KB Created: 2021-03-11 00:24:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1747502ff2fb328fd46286c97c8eb4d9 SHA-1: cff0251201740e113f7630d9d84090dfa49e4495 SHA-256: 5670da2e979e6bd8f9f012feeffce054eefdb6b0fe0863c08fb954d365564a5a
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/123?utm_term=how+to+backup+bookmarks+chrome+android PDF link annotation
    • https://cdn.sqhk.co/jawezumate/3hegdhj/tuwusovuvovumudebevenevi.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/jNbPjd3/rexawoxu.pdfIn PDF document text
    • http://zegobudipaju.mywebcommunity.org/the_adventures_of_tom_sawyer_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/c2jiiaV/kibozukigutolu.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/0giiahi/dogfight_1942_pc_games_free_download.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/708c61c3-ea6c-4a48-96e4-36e288e9058c/lofotabatutilazi.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/english_language_gcse_aqa_revision_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/041be542-8b56-4f3b-958b-ad3b86eaa638/how_many_calories_in_chicken_and_mayo_sandwich.pdfIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_f547bd8e23ae4baeab3f2ca12b362d85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bofake/dutopazerisijunibudesapij.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/turtle_beach_px22_inline_amplifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f159c8f-7e97-417e-885e-44921a53ea1c/badolekobuk.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/benefits_of_regular_exercise_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/1264699247.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_dc41d18310c04e46af9e798fa0406748.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeponowon/critical_ops_pc_no.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_56d571beb6a14d03a8a44a5e29ec18e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jovekus/jipimalamutakafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead75892-1c44-497c-899c-f0eb8d1a6fb9/how_do_you_cook_pork_in_a_slow_cooker_uk.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/rode_videomic_pro_battery_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcce58a2-3eb9-462b-9471-330a09fdf098/a_different_mirror_a_history_of_multicultural_america_chapter_5_summary.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_dab195e3c99d497eb04bf6f0755f95df.pdf?index=trueIn 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_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 5536 bytes
SHA-256: 81a21a1392dee2d49f47ec886fb85649cac14e96186fe976eb2da32a96c66177
font_01_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 10400 bytes
SHA-256: dc9438ba422bb0fbeaad9eb79fe2b59dbce15d2a4b4e56cbb0be9dcd3bc347d5

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