Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86f178981343204…

MALICIOUS

PDF

85.7 KB Created: 2021-03-29 00:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b198a3e4516be39343b9aca9b48e02f3 SHA-1: 76191c2833a996f78975c6e47f69fa214a2bf3f4 SHA-256: e86f178981343204128d81bd954dcd3b118ad04d6ce54dbcb0a5fb5b93ad7914
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing operation. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack pattern designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://pelibifir.ru/strik?utm_term=lista+de+verbos+en+ingles+y+sus+tiempos+pdf PDF link annotation
    • https://cdn.sqhk.co/futevanu/c4hcsjF/52108431482.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/Y93ghjh/huey_lewis_and_the_news_greatest_hits_songs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425209/normal_5ff57ea60c64e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_600e3ef0069e1.pdfIn PDF document text
    • http://tujemet.scienceontheweb.net/anger_management_ppt.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/is_coconut_oil_non_hydrogenated_shorteningzop37.pdfIn PDF document text
    • https://cdn.sqhk.co/sijaxovada/aNihhfH/jailor_and_warder_exam_2019_key_answer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487382/normal_5ff9bf7bd407a.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/ia01grK/2010_ford_super_duty_towing_guide.pdfIn PDF document text
    • http://nariwunuzaw.scienceontheweb.net/angina_de_vincent_tratamiento.pdfIn PDF document text
    • http://texoraw.sportsontheweb.net/38694639909.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5fcf063c545cb.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/Suhgygi/double_alpha_gun_belt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://makakanow.onlinewebshop.net/human_resource_mgt.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_87fc539f1d0b4881bc1975fe69f7c2ac.pdf?index=trueIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_d9bdbad039fd4b81a3a46088b56df323.pdf?index=trueIn PDF document text
    • http://zizenatoxu.myartsonline.com/5990399660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cab37d92-a412-40e6-ae34-75e75a8fdd8b/14918527119.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_5904909842bf46b3b9c14650704467d3.pdf?index=trueIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_78d64f9176bb4912812a69898f67f6d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f01dec5-c8cd-4f6c-bbb3-dd2cf950d1ff/dazevuxudozuge.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_ee0f4f156a1f447eb5fa0faab30604dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/704bf671-a253-4dba-8d8a-af70e43fcab8/ralutavezinumavuboguli.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 5604 bytes
SHA-256: a584666c7dce0e8fa8d06ac119fd4e35fe1f6afb3a9c69e634860ce3ef4e4ccf
font_01_sfnt_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 10532 bytes
SHA-256: 44b2c2bc763a4b574f2003553c017cd3d7728fa908bff4c8e294ff18747d6c44
font_02_sfnt_off00013144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13144 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e