Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7536db7a5faab1f…

MALICIOUS

PDF

81.0 KB Created: 2021-03-02 19:39:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 78150f4dbb148d9c31bce277a70b5849 SHA-1: 70c0c36d38e91d766fd6ca74f6c508bf376a3431 SHA-256: b7536db7a5faab1fb8c19011a36a90eba79a12cdf115e50fea810747f165a189
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to contain search-related keywords, reinforcing the idea of a lure to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/123?utm_term=what+size+breaker+for+lincoln+225+arc+welder PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404753/normal_600de5b4b19ad.pdfIn PDF document text
    • http://myimperfectmomlife.com/marketing_planner_template_exceld172l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481069/normal_5ffcd5097c38e.pdfIn PDF document text
    • https://cdn.sqhk.co/velomegu/i7zXyvL/luguvobexik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367938/normal_601b4a29cb7c5.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/iiBzxhb/99231585392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5fd13a730dff0.pdfIn PDF document text
    • https://cdn.sqhk.co/bipozipo/nuioiay/dabufuzisetumarijizetomi.pdfIn PDF document text
    • https://jabekidedur.weebly.com/uploads/1/3/1/6/131636775/328318.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/NZnohdg/superhero_wallpaper_hd_for_mobile.pdfIn PDF document text
    • http://cleaner-inn.club/koxonezuluf9tnvf.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotefi/ehhjdjb/mavuluvujede.pdfIn PDF document text
    • http://avit0.pro/alcatel_omnipcx_enterprise_datasheetq0btl.pdfIn PDF document text
    • http://submonster.xyz/common_core_sheets_dividing_fractions_word_problems2eisd.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/sazomo/beavers_bend_fly_fishing_guide_service.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_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 5724 bytes
SHA-256: a926519f22d2e5be6ed4b94aa39c3ef7674679060f3de166edeec32600b563fe
font_01_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 11456 bytes
SHA-256: 94b6e10ff6af7ff7eb74c0f688eb3a9858808f69748d00732c8047022d9402e8
font_02_sfnt_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 16080 bytes
SHA-256: 24a56a00ebdfbb4b5b72d249a8195892d08ab8c6d2bc1baeb1e65ebcc908258d

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