Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92c6b3ca386b4e8…

MALICIOUS

PDF

87.0 KB Created: 2021-04-05 11:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 114afe58c606f63eabb1e2055fcead08 SHA-1: e7b30b31b36eb3433a6b5b07b8163254c0d073f0 SHA-256: f92c6b3ca386b4e8cad9e6a28588a36cd80216b586696c99bb79845f446a8ecc
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 0.9997

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://nipisod.ru/strik?utm_term=nordictrack+commercial+1750+manual+2015 PDF link annotation
    • https://cdn.sqhk.co/vomifavafo/kc4ihih/anuragini_video_song.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/jeiaBhd/defolokowajixeratapukitiz.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/ibv4Xib/zufojiz.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/1e9f2614-f057-4ecd-91e7-01e0ad43454c/what_is_the_salary_of_an_accountant_in_dubai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a80cccf4-08e5-4427-8b2e-bf306774faa5/heat__glo_fireplace_remote_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60aa9ad1-1a2d-4d72-905c-9e3bfa4c260d/samsung_syncmaster_2333hd_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1894a536-0cd3-4bc1-8e59-c6f09ae9233f/lenovo_thinkpad_t420s_windows_10_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9508912d-00fd-4207-95b0-9397365b9f2d/zumo_660_motorcycle_mount.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/56644122736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6d6d57-411b-44a3-8c76-a6e10f656638/how_to_say_hello_sign_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94c13c76-9337-454e-9640-6869be7cf796/90296561092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6025ebed-62e0-447a-8c16-1eade04a4a4a/excel_formulas_multiply_quantity_by_price.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/assignment_cover_page_template_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/wewejutawumusuju.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/borland_delphi_6.pdfIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_c46a5b2d50514852ab3ad599675c2e55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwara/how_to_answer_questions_english_language_gcse.pdfIn PDF document text
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_ebab7db55881486e9dbd56d90fcc5cbe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75117839-9a93-4d94-bcc5-13c43e01a881/stanley_fatmax_16_tape_measure_warranty.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 5472 bytes
SHA-256: 501db67a235a69dc7563faa8f76eb3fa982ef761bf5cf44b2556077286d65dd3
font_01_sfnt_off000111b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 10964 bytes
SHA-256: 49a86acfc3c9d42e533694a3c5797c78b9450b165153e5677ae7226e7e59c0a1
font_02_sfnt_off00013765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13765 16196 bytes
SHA-256: d1a4c78ef556d8252eaaeead95fd6e0540edb04596780bf3770e55fda0b1f776

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