Malicious PDF — malware analysis report

Static analysis result for SHA-256 71575c9bd081503a…

MALICIOUS

PDF

82.3 KB Created: 2021-03-21 06:10:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: df7626baf68f6d347509155d00b97570 SHA-1: 5b4ba6d1b14beaef2a26b77f71bc27f1255e1c70 SHA-256: 71575c9bd081503abea64f05b62cd6df0872727e9468a65c0cc2dbebb30c7f8e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document's deceptive content about an aptitude test are consistent with a social engineering attack.

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://bologen.ru/award?keyword=aptitude+test+for+cabin+crew+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466657/normal_5fd91d412c3f2.pdfIn PDF document text
    • http://lutafem.getenjoyment.net/muzopoguku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_5fd770a6b8be8.pdfIn PDF document text
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/xewetimiw.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/woxum.pdfIn PDF document text
    • https://murufafutebe.weebly.com/uploads/1/3/4/4/134473477/baniwosijuloraw.pdfIn PDF document text
    • https://mazegiwekode.weebly.com/uploads/1/3/4/5/134529082/tifodiwogikoz.pdfIn PDF document text
    • https://mokoxobijukox.weebly.com/uploads/1/3/4/3/134321678/c02c91d27214.pdfIn PDF document text
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/36f6c719777095.pdfIn PDF document text
    • http://meetchat.space/what_does_604_mean_in_angel_numberskgfis.pdfIn PDF document text
    • http://umdtheatre.ru/93569427381j2jyt.pdfIn PDF document text
    • https://fugikoji.weebly.com/uploads/1/3/4/6/134611078/8880058.pdfIn PDF document text
    • https://rajiketuwomap.weebly.com/uploads/1/3/5/9/135957261/4776333.pdfIn PDF document text
    • http://tihefers.online/bronx_new_york_weather_reportwgme2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5241189-f60a-4161-94ed-15adaa40a243/where_to_buy_humidifiers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf8f9bb-dba7-4154-83f0-27b8a2a98f1a/how_to_program_a_chamberlain_liftmaster_professional_garage_door_opener.pdfIn PDF document text
    • http://ludugatitabi.atwebpages.com/pdf_marketing_planning_and_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56959032-4681-4568-8b2e-4b8ec727a3ea/how_to_get_acceleration_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb00d65-0a50-487f-99b8-6be1a685bb4e/60629778039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc3b20b1-7e22-4164-804e-9c45a80b4212/bakibakerawetakeko.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_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 5336 bytes
SHA-256: 574ae948c9af0e4e9ccef7589ad10fb7dddbfe4fd847b54ef438cf83c1db60c7
font_01_sfnt_off000114c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C5 11876 bytes
SHA-256: 89d213578d3d614160583c177b0f048950a8637270397e9e8aff348f27ca1f7f

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