Malicious PDF — malware analysis report

Static analysis result for SHA-256 36311928b3ebe3ba…

MALICIOUS

PDF

76.4 KB Created: 2021-02-26 07:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e05049f2b187827c7a6341da46cb8c27 SHA-1: 508b02e01dc94bc94395b546c4b7d02937260b83 SHA-256: 36311928b3ebe3ba471b050bd9c0fb31d5d3e6585f25f88d06bc7fc103e60363
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the heuristic indicating a link farm strongly suggest an attempt to trick users into visiting malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jottigo.ru/123?utm_term=ionic+breeze+quadra+professional+series+s1737 PDF link annotation
    • http://stnold.com/crazy_driver_taxi_duty_3d_mod_apk_revdlwo32p.pdfIn PDF document text
    • http://my-favshop.online/decile_report_in_excel5ynb9.pdfIn PDF document text
    • http://lnstagramoriginal.com/python_list_formatter3ojry.pdfIn PDF document text
    • http://seomagnat1.online/mifedurijivusimotetakqd8a0.pdfIn PDF document text
    • http://cheatyou.site/statistical_methods_in_psychology_online_course_free54diw.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/tobatoza.pdfIn PDF document text
    • http://afracheat4.xyz/strength_of_materials_book_by_singer32x95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422372/normal_5fcc02cc9f380.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/cwedhis/puffin_web_browser_apk_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/gc7ifgg/colored_contacts_online_usa.pdfIn PDF document text
    • http://lnstagramsupportlives.com/xofinifuvutezurekabuq1ywu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zalowakudedakov.rf.gd/bleacher_report_fantasy_ranking.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/kudipiz.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 5700 bytes
SHA-256: ecb9a8b53e7efa0dc8adb25c4748a21aeb9b3bc4e703a01eaf214f84f1adf5cb
font_01_sfnt_off0000ffce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 10696 bytes
SHA-256: 389caf5ad1839cf76f5904424262092aebc581e7fbb02ac632afbc034dd8337f

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