Malicious PDF — malware analysis report

Static analysis result for SHA-256 425f225c290d9330…

MALICIOUS

PDF

76.2 KB Created: 2021-02-24 08:11:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7ad19877cbc0babdd08bf538d31f67c1 SHA-1: 22aeefeab96e80af3136549e6cae0e4f4164c946 SHA-256: 425f225c290d9330d2f37c7e7fd8a9692d62e80c77d04fbf5d68783a2a3e6ccc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were extracted, the presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious sites.

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://druttle.ru/123?utm_term=que+es+composicion+corporal PDF link annotation
    • https://cdn.sqhk.co/moxoxitij/A8e1zhf/learn_android_programming_from_scratch_basics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_6035a3186a3f0.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/ojijbhe/54437961765.pdfIn PDF document text
    • http://istlan.fun/mesa_boogie_dual_rectifier_roadster_2x12hj7r1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5feaf3249e16b.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/jdaijAU/rocket_car_racing_apk_download_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367287/normal_5ff5b693f3f6b.pdfIn PDF document text
    • https://cdn.sqhk.co/mavozopofug/t7gjquV/odd_eyes_deck_legacy_of_the_duelist.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/Pjfghdb/32284207599.pdfIn PDF document text
    • http://sujatafuluwariv.22web.org/balam_pardesia_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/s0v9ic6/blackfish_lives_matter.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/dngjf8t/52162739909.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zivumimilalak.rf.gd/spa_gift_certificate_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/lexique_anglais_franais.pdfIn PDF document text
    • http://temomel.rf.gd/kulobusopaxug.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/java_tutorial_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/ujsportal._pacourts._us_docket_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/german_national_anthem_flute_sheet_music.pdfIn PDF document text
    • http://nupopejif.epizy.com/41331328901.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_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 5140 bytes
SHA-256: 87df447e050c7af27705011a015ef806a9e87070320a5c79160ddfff21bffcb8
font_01_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 11796 bytes
SHA-256: 07d8da1e3c9cc72171a44e39a304c8d318e869c09bf03182e54b9ea9caf4cbd4

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