Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81a2a3c6245a48c…

MALICIOUS

PDF

76.6 KB Created: 2021-03-17 15:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 35a64429a4f4cc04b19081f7550cd5da SHA-1: 9469f5a724228b0a047359325bc03350e0f5d487 SHA-256: f81a2a3c6245a48c5ecdb835627dc7978b747456d8647f4dc7989338e9d945b0
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or SEO spamming operation. One of the primary URLs extracted is 'https://nipisod.ru/award?keyword=agile+hardware+development+pdf', which is likely intended to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nipisod.ru/award?keyword=agile+hardware+development+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421776/normal_602cb25444644.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373239/normal_5fe05e46e90b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500200/normal_5fca682fcd833.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/fonazuzixagizir/contrato_de_arrendamiento_vivienda_urbana_minerva.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_0c9122663d7c4c9588706c2644933b06.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dalava/java_tutorial_for_selenium_testers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11e0faa-d2d3-4787-8c26-d22caa0e0ed5/doxewunetadibotag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f427dac-105f-427e-aa82-45109d33368e/11542248223.pdfIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_b2a1ce97f9754e6896601fcdb2e396dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/189ae9b5-63ea-4d8d-8e56-937d2d133c15/79445575383.pdfIn PDF document text
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_382942213c9a4c26a4283aefb9cc2a78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6232b9e7-9e6d-4475-865c-e8a9c8bba757/66929992267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc05117-a87e-434f-8daa-cfa55b7338cf/fukisadoxomutozuxitusel.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/nuzapetuz.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/swan_neck_deformity_vs_boutonnieres.pdfIn PDF document text
    • http://jolavewavesuj.epizy.com/saluzelojoru.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/deshabhimani_aksharamuttam_quiz_questions_and_answers_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d7bdad-0c88-451f-9372-7951f1465a3c/evan_moor_math_grade_1.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_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 5416 bytes
SHA-256: 0af5d3b4d86adfa356263c390a1dd85dd62c0be9899366b2fe535446e411104a
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 10416 bytes
SHA-256: dbfe6fca99be0cae558d59b4feea2d7440d64169a6c08078b462536dd0f07ffd