Malicious PDF — malware analysis report

Static analysis result for SHA-256 984ccaf2e02c45eb…

MALICIOUS

PDF

78.3 KB Created: 2021-03-13 23:34:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6fd15940e4fefdac8e56d18e47dc51e9 SHA-1: 1323dada45dc95f9b71a0525f74d7123207b808b SHA-256: 984ccaf2e02c45eb3f400dc0e71e41f20a06756226b7bcf7419f5332cfac7ccf
186 Risk Score

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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/award?keyword=present+tenses+exercises+pdf+with+answers PDF link annotation
    • https://cdn.sqhk.co/xamitarerivu/Qavgfoa/82994299527.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/MhaynuV/sisaruzafun.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/pjficjc/chinese_new_year_stickers_for_whatsapp_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/wasefago/djajaic/calculus_textbook_thomas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_d869123e3d5e4f4e940fe9f42e4e4b39.pdf?index=trueIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_5c1e1c9806194f00bbc7de82fcdb2292.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_879041851e374953a487b45160eb74de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8780bcdf-63dc-4e22-8410-bb741dc44fb9/mupusanirodorasutumuvizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e3dbc3-76ef-4ec0-9936-748f0bb976f3/now_im_begging_for_footnotes_in_the_story_of_your_life_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/wokefaraso.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_9cade1f53b1b4ac496bbc92e118f4661.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_ac08cc1411064b5ca39265a07c09fd91.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_a1dce77fd5254b9386a3f3346c80e0f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f786b0-5eda-43a7-8544-2df799e5755f/plantronics_bluetooth_headset_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/tovidugisapolupejem.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/les_mis_play_script.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_0c8565e04c524097a1b09a1f5e163db9.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_42a6948250144f63b366acc8afc07ce2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db7bae18-586e-4072-8d1d-8bf6c2a41638/how_to_open_a_cannon_safe_with_keypad.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/6230513882.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/a_christmas_love_story_full_cast_2019.pdfIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_cace48b3ceb1433ca7ee173b17f4667a.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_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 5372 bytes
SHA-256: 286920a88141a44091134d4be006af45bd035b631ba275c2b6de77af9152c72a
font_01_sfnt_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 10840 bytes
SHA-256: fd17bfc0f02d07822d19e2385219b6f80d60d29b6847f32aed264fc1b615a29e