Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f2913eb1ae746b…

MALICIOUS

PDF

75.1 KB Created: 2021-03-22 05:12:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b4975cc893b089e87a9e7c17dd180145 SHA-1: e478b0c9271e48bce5a2cc6575931e256a62dc92 SHA-256: 52f2913eb1ae746b1d638dd4237a7abd59233a1e34db8d129cc76cc21aca0061
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a tactic to distribute malicious content or phish users. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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=business+english+presentation+exercises+pdf PDF link annotation
    • https://cdn.sqhk.co/kopilixa/hhjgjgP/among_us_mod_menu_android_apk_always_imposter.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/ihagcih/77313725205.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/ce1ibgh/business_analyst_certification_for_beginners_online.pdfIn PDF document text
    • https://cdn.sqhk.co/kofisosiz/w2gfKhc/36778532626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/setikizo/gekaraneva.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/ledonafaburatowodubike.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/bejeweled_blitz_free_no.pdfIn PDF document text
    • http://bobakazof.epizy.com/program_browser_internet.pdfIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_ef6be5d2ddbb45dfbe6f3dde10931a72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/tajaxularinivetadomokege.pdfIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_fe90b0bfd847442780c68b5a0fb3fd3a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/48111193081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35427915-e22f-4986-ba65-7fc86c43a49d/89833048352.pdfIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_3a483266ab764d1381bb6ab73c5d5cc0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9acefb4e-a819-4bd9-acdc-ee590c1532e0/what_type_of_battery_does_a_smoke_detector_take.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/zajapazegiledovadobofirug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ae470e5-cc62-4829-bfb9-9e9278f09424/monukenap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb045741-7c43-453e-a865-fbd70df352ed/77818366130.pdfIn PDF document text
    • http://nupifikitove.epizy.com/ruzarugubuzolonegipipuju.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/60776232040.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/wodativotenoru.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_off0000e5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 5532 bytes
SHA-256: a423c80d7ef7164f826245e5b8402ee3eac25eaacec8f6f27d1ad007b7b67417
font_01_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 11284 bytes
SHA-256: 1c4ca07339e57bd227c16c3c6f7ff2346d6953542f32599ab0396caa3b727a3a

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