Malicious PDF — malware analysis report

Static analysis result for SHA-256 4950b6581d7ee142…

MALICIOUS

PDF

82.2 KB Created: 2021-03-21 02:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2f711331027c81154df05355c1d1e153 SHA-1: b48439adc271d16288df8cdcb0d890d170ef7ccd SHA-256: 4950b6581d7ee142147085bd49db2e6d5868a382c5a41dc8ff95cb2ac99c6f43
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains and link farms, indicating a likely SEO manipulation or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://botokaw.ru/wix?keyword=gm+3+bar+map+sensor+autozone PDF link annotation
    • https://cdn.sqhk.co/batijuretak/heieJhc/amazon_alexa_dot.pdfIn PDF document text
    • http://sutivetowit.mypressonline.com/classification_of_antiemetic_drugs.pdfIn PDF document text
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/xavuzud.pdfIn PDF document text
    • https://cdn.sqhk.co/jivapereb/aghlUjj/ruvodosakiro.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/december_sat_test_centers.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/jjfKNjg/sawegejobaxakeworoxabi.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/ggjOMjg/free_printable_word_search_puzzles_thanksgiving_us.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/hehfGmz/negibolox.pdfIn PDF document text
    • https://cdn.sqhk.co/tudenireso/iaheVgj/vunoxuzuzafafakos.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/TCUie66/drum_kit_online_keyboard.pdfIn PDF document text
    • http://naguvogegexaze.22web.org/65243239622.pdfIn PDF document text
    • https://cdn.sqhk.co/govamopega/ejeghhx/1st_grade_math_game_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/ewPEjh7/my_safe_notes_app_forgot_password.pdfIn PDF document text
    • http://rekugegik.scienceontheweb.net/11573999615.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/sample_letter_to_employees_regarding_safety.pdfIn PDF document text
    • http://desokore.medianewsonline.com/thermador_36_refrigerator_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/joxutedunik/glajMhc/best_3_point_shooters_in_nba_2k20_build.pdfIn PDF document text
    • https://xavilisepu.weebly.com/uploads/1/3/4/2/134235747/suzipulize_xewadip_tupovasev.pdfIn PDF document text
    • http://dodonutore.iblogger.org/fusionner_2_adobe_acrobat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 5320 bytes
SHA-256: 4d3ae9c99220446800fc24b7cd06d1c62f94953ab5c9dee7848446c28fa345d6
font_01_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 10912 bytes
SHA-256: 81524fd33dec1ee127b41f2c189bec7c48d57efb945e90e150bb5e84435dc2ab
font_02_sfnt_off000126b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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