Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09b725612dab3b9…

MALICIOUS

PDF

77.7 KB Created: 2021-03-06 14:07:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 23b9953ac454c17918502d1d6c0e1d0c SHA-1: 7c5514890bd379c9dc0b4e4af0393347f83a010b SHA-256: f09b725612dab3b9f5816d2c33277f2e50c7f90c83853bee27fdf63b702ec53e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO spam. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious activity, likely related to directing users to potentially harmful 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://zajinet.ru/strik?utm_term=polaris+xplorer+400+carb+adjustment PDF link annotation
    • http://sellamorem.com/635263535121akzo.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/apc_ups_be550g-gr.pdfIn PDF document text
    • http://ketadiets.site/sportspower_10ft_titan_super_tube_trampoline_enclosure_ladderqk64h.pdfIn PDF document text
    • http://bexixibeguben.sportsontheweb.net/all_souls_cemetery_hours.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/luxamegibepuvolagalusov.pdfIn PDF document text
    • http://disclosures.space/93554281568mohbf.pdfIn PDF document text
    • http://matawobedopikam.mywebcommunity.org/trolls_dance_song_cant_stop_the_feeling.pdfIn PDF document text
    • http://trells.space/65663715943jmf8k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_e75f483e3e774ccdab7af6aca0abaeeb.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_126943725aca406caf4f69f3d2b28b6d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/74225033669.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/what_are_the_conflict_management_strategies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9419fd7-74ca-452f-bf79-d3571e360cf3/who_initiated_the_idea_of_communism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c552e99-4011-4039-b468-ff36ace7b70d/23957099995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dfb4fa6-9d6c-470f-80da-d3da899bc3d6/how_to_do_seo_in_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/ralobimidoxijasagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8308df3c-255c-47e3-ae71-3c1341bd8f97/2004_dodge_ram_1500_quad_cab_tire_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24ea4e5c-6430-4f37-b3f7-3c1369b3b48e/caracteristicas_de_un_algoritmo.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_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 5732 bytes
SHA-256: d51a4345c3cc6fc50a6c641f12bec3d659352562f6b9e4a6b88689e95e20531f
font_01_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 12044 bytes
SHA-256: 7356fe5ae2ff4400b256484704e6ddf2a160727c125f618625b72868149ac262

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