Malicious PDF — malware analysis report

Static analysis result for SHA-256 320c1ac055aaa890…

MALICIOUS

PDF

79.6 KB Created: 2021-04-05 16:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d08e221c4b2e80e0b6b96d433aed1a63 SHA-1: 5d90c68d573962eb72a5f0c79fb43bfe6b5ee5e7 SHA-256: 320c1ac055aaa8901dc470b6a9ee9d4451e7cd83fabdd6b73281f6093550632b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as book downloads, indicating a link farm or phishing attempt. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure suggest it is designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=chess+game+learning+books+free+download PDF link annotation
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn.sqhk.co/laxiroroweno/hgid5ib/airbnb_pet_friendly_with_pool_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/jfjcjc9/65198796402.pdfIn PDF document text
    • http://arthromedro.xyz/kundli_program_software_freexipyz.pdfIn PDF document text
    • http://pubgucbayim.com/jalifilesob4noqi.pdfIn PDF document text
    • http://dimax.website/beziwitedifuvokeoer2j.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/B8yhaih/39126569552.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/eLjchh6/50831406899.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/RQhchhj/7568794246.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/tenunud/7569112369.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/active_and_passive_form_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6686333f-773b-4414-a2b6-ecaa3c1bc925/ejercicios_de_derivadas_de_funciones_trigonometricas_resueltos.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_e8b2d977e22a4b009824329141368dd6.pdf?index=trueIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_07d87873b56a4f5eb69f882b647c7964.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/apple_earnings_report_july_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/dell_latitude_e7450_i7-5600u_14_test.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/ravojuzasenarixuli.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/kexaxexosedorawi.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/33389932646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4a97dd-b209-4459-8cf3-aff13d9024f9/muvome.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/80856051119.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/happy_birthday_funny_status.pdfIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_a7106a76ba7743e3bfa1a20456933160.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_off0000fa9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 5520 bytes
SHA-256: 074f42af7b39653b12b74087d3f562598d656b2cb92ad41d029468847aa43b82
font_01_sfnt_off00010d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D42 10376 bytes
SHA-256: 60d99c2844f5a3c7ac78bc8d0b8fece4effdb221d7fbc0464bc488f706de67ce

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