Malicious PDF — malware analysis report

Static analysis result for SHA-256 645c73b35fc4d3dc…

MALICIOUS

PDF

77.7 KB Created: 2021-04-03 16:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d6025c2c5bb58d3a70f534a3bbca2f7b SHA-1: 2c5961ea10b0d9b7c8a98582eec1da5e06abd873 SHA-256: 645c73b35fc4d3dc14456b99b41ff63d6490c505c712d250f97fe15ee3b3e9c1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier indicate malicious content. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://seumenha.ru/wix?keyword=metro+resa+tapp PDF link annotation
    • http://sfhgfje5df.xyz/roxovofotofoba897.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/36439550030.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/nuestro_segundo_cerebro_libro.pdfIn PDF document text
    • http://bapadama.medianewsonline.com/behold_your_mother_tim_staples.pdfIn PDF document text
    • http://finonit.mypressonline.com/biochemical_test_of_bacteria.pdfIn PDF document text
    • http://goloszauniver.fun/gamebryo_engine_downloadpklpi.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/87854202210.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_75e6ac644f9b4071a685799658273910.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f46c8b7-2a74-41af-97e6-e73f1c085f6b/junie_b_jones_dumb_bunny_read_aloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ceb3bc-05c9-488f-9ed6-a25c5e5629a3/construct_2_download_for_windows_7.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_61831031ce3a4a168c379ddc650879a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/83849630555.pdfIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/what_kind_of_transmission_fluid_for_2003_ford_ranger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531b3007-7c68-4bd8-9704-33898b910f5e/xazaxodilaluxaviborej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24939e27-2a71-44cf-b2ae-d30112d6cc53/family_tree_worksheets_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498facb2-06a8-4939-9592-edfc5b6681d6/significado_de_los_simbolos_del_diagrama_de_flujo.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/aqua_barbie_girl_video_song.pdfIn PDF document text
    • http://zilisidojaze.myartsonline.com/70524362133.pdfIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_e1e68e216fe24b29982e6c1840e47077.pdf?index=trueIn 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_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 4788 bytes
SHA-256: e5264c5a4325dbf16600b8ec1fd0e39d69eaa99eece8862bee06d36d3063f303
font_01_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 11480 bytes
SHA-256: 3dee76ded6542bd841592951903a3466beaf24d3b856cb52f48d2d7d44aae90c

Open this report in the interactive analyzer, or submit your own file for analysis.