Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f4a6e80065dd1a…

MALICIOUS

PDF

74.9 KB Created: 2021-03-01 02:48:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c27e5fed45b473261a7b3b733a9b753 SHA-1: 029f398fa5db089cb6a790743a1f7f00949eae6e SHA-256: e2f4a6e80065dd1a4e49ec0b3fe1e2c16efed81cc7c87b600d065abcad1acc65
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various domains. One prominent URL is https://kuzutuzo.ru/aws, which is likely part of a phishing or SEO poisoning campaign. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/aws?utm_term=how+to+report+dividends+on+tax+return+canada
    • http://yazansoft.com/2095227099622v9a.pdf
    • https://cdn.sqhk.co/nemazuwigumo/jjBhahj/table_tennis_3d_game_download.pdf
    • https://cdn.sqhk.co/bitomasijelo/Whaibhi/dubai_safari_park_call_center.pdf
    • https://cdn.sqhk.co/mofijovelu/xhijdha/rogue_racing_enforcer_bumper.pdf
    • https://cdn.sqhk.co/xizowabik/gjjh4Po/mujas.pdf
    • https://cdn.sqhk.co/xurajalijok/Mjc7jej/fapuriwukupufekawa.pdf
    • https://cdn.sqhk.co/setewefasari/Aidzhhe/amazon_kindle_forgot_password.pdf
    • https://cdn.sqhk.co/merabuvi/hfqahhO/online_shopping_clothes_uk_mens.pdf
    • http://usacreditreport.info/2nd_grade_math3lm9p.pdf
    • https://cdn.sqhk.co/narulaloro/ghjjhc9/rejabe.pdf
    • https://cdn.sqhk.co/xixujipum/Hik0jd9/best_online_marketing_companies_in_kenya.pdf
    • https://nisutezobeta.weebly.com/uploads/1/3/4/4/134486685/wifisujusaru.pdf
    • https://toziraza.weebly.com/uploads/1/3/4/5/134506396/9259040.pdf
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/5635846.pdf
    • http://aires.fun/csi_exponential_functions_and_logarithms_answers1aqcz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jujadodedaruxix/raxixubokonotado.pdf
    • https://s3.amazonaws.com/xifabilejilab/nagomidosekomugupaf.pdf
    • https://s3.amazonaws.com/vibasujefir/fuwad.pdf
    • https://s3.amazonaws.com/tanikanaw/network_diagram_tutorial.pdf
    • https://s3.amazonaws.com/nefomojuwet/photoshop_action_software.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c5.bin
cf8feeba63e43942f9e2da61fe51657ead3324a321f69208e1be1ffc40b20ebc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 5216 bytes
font_01_sfnt_off0000faa9.bin
1db10d25ece3fe98f5a9c7fef8037a7dfa8d2f454140385b61dc8527d2b9a583
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 10520 bytes