Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ef7c728637020a…

MALICIOUS

PDF

78.1 KB Created: 2021-01-11 23:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4a4d04d4817232b2b922d3452aa73dae SHA-1: 5c1c22c91f0628b0fade8f18036d8fb12bf51719 SHA-256: 03ef7c728637020a2c66e5fd8774d14774e48c9ef4193519a647077f95d08a0e
192 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains keywords related to downloads and applications, suggesting a lure. The presence of numerous embedded URLs, many pointing to disposable hosting, indicates a link farm designed to direct users to malicious content, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffmen.ru/wb?keyword=magic%20tiles%203%20song%20download%20mp3 In PDF document text
    • https://nixewoxeb.weebly.com/uploads/1/3/4/3/134354190/675620.pdfIn PDF document text
    • https://site-1168274.mozfiles.com/files/1168274/linear_regression_in_r_predict.pdfIn PDF document text
    • https://site-1177775.mozfiles.com/files/1177775/nixekawag.pdfIn PDF document text
    • https://cdn.sqhk.co/gumorefose/icThgC1/playstation_network_account_login.pdfIn PDF document text
    • https://site-1174423.mozfiles.com/files/1174423/star_wars_jedi_challenges_ar_device.pdfIn PDF document text
    • https://site-1175626.mozfiles.com/files/1175626/zig_zag_dance_factory_baby_ballroom.pdfIn PDF document text
    • https://cdn.sqhk.co/gefisodir/hgja4ji/lujajidigo.pdfIn PDF document text
    • https://site-1175310.mozfiles.com/files/1175310/henry_stickman_escaping_the_prison_unblocked_games.pdfIn PDF document text
    • https://site-1174481.mozfiles.com/files/1174481/piggy_go_ski_race_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/fWWIGjj/usa_today_mini_sudoku_answers.pdfIn PDF document text
    • https://rejudizik.weebly.com/uploads/1/3/4/7/134701546/2256367.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gazivemon/army_amino_latest_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/16508543941.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5F 5560 bytes
SHA-256: 672acfd7a7397b3b88c72348d7d622b6a3be5ca9364f1e749b56779582cd996d
font_01_sfnt_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 2140 bytes
SHA-256: 3eadf3ff1ae85f7a2dd8be852d633ca148c1d24200a16cbd4325889adc5789c4
font_02_sfnt_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 11324 bytes
SHA-256: f02b3fcbb1f416e29151d703b926dcd0b5b0706eccec9b30db0ca4156f3f9d96
font_03_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 17960 bytes
SHA-256: f823979f93a2b8c39d233a236602896c6729648b87d084bd14d149c1ce522bef

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