Malicious PDF — malware analysis report

Static analysis result for SHA-256 634bcb86dca5216c…

MALICIOUS

PDF

76.9 KB Created: 2021-04-06 04:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b43203d09c603f91551cdb241b8e5cba SHA-1: d3a1112ae67e1d6447cd1a702d39e2091dbbdfdd SHA-256: 634bcb86dca5216ce77fa6073d63ff82489919463a30e1e5403942fcd1802d14
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 hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/wix?keyword=what+to+spam+in+chat PDF link annotation
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/2882314.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/mifovonulimobeduwav.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/bhaqjgK/jungle_boy_strain_names.pdfIn PDF document text
    • https://lanuwoga.weebly.com/uploads/1/3/1/6/131637333/rosutajugis.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/Ko7opgd/lofolulatawazelifekijusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_600e51b0e85be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450636/normal_604e63bbd6f0c.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/724ae7ed0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383922/normal_5ffb11a48bfbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_60258a4ddbf8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451229/normal_601723e9b1d8d.pdfIn PDF document text
    • https://wagalivo.weebly.com/uploads/1/3/0/8/130814328/tibikujix.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/sIlthiZ/crunchyroll_store_customer_service_number.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/b2e055e6-9eab-4ec4-b084-bb4a49701ab2/32859052890.pdfIn PDF document text
    • https://09ec27ad-13b2-4d6a-9bba-a73d40af2dac.filesusr.com/ugd/309646_8a5be9747a2b445b99cafc91fe57bab6.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_e992b7bcddf44341acd3972ebb8b4552.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_e72d07b55c8c4b4e9c518e8727f7073e.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_5afa662f78834ec7ab33dc6b38e6bc8e.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_cd017b77154741f589333e528c853659.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_9edc562c6b7c4f579a70eab378b61642.pdf?index=trueIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_704262ece7fc4fa98cf9e581b1f25fd4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b3c9a18-cca6-44e6-86e2-c8eabd939440/afterglow_xbox_360_controller_not_working_pc.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_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 5060 bytes
SHA-256: 25d5f5b39ef4048a57a6a98b56b53f1baf061dbccf0fe23d008c9f98297ce346
font_01_sfnt_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 10804 bytes
SHA-256: b69e00bead17ca4251852ff307df0e6fe4e1d451486686f585b09e3da4776983