Malicious PDF — malware analysis report

Static analysis result for SHA-256 557773c7f11c0e43…

MALICIOUS

PDF

81.8 KB Created: 2021-03-27 16:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d05db72f174ceccbd75dbcd646705e00 SHA-1: 71f40fff88fae6a784c9cb7c843dd6e16dd5c8da SHA-256: 557773c7f11c0e43323b210e8e39bb9692f63bb5902b58654d799ddec885fba1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=how+many+calories+should+i+eat+a+day+for+my+age+and+height PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415518/normal_5fd1fd56151a2.pdfIn PDF document text
    • http://raponikidosal.getenjoyment.net/sap_bpc_manual_espaol.pdfIn PDF document text
    • http://reduslim-shop.site/managing_bipolar_disorder_worksheetsu6580.pdfIn PDF document text
    • https://vitafidazi.weebly.com/uploads/1/3/4/7/134728623/4d58e5334c4f02.pdfIn PDF document text
    • https://zifimegepero.weebly.com/uploads/1/3/4/6/134601706/vexunaduvudu_finedeke.pdfIn PDF document text
    • https://cdn.sqhk.co/zaborofisi/ehaMRia/67145042146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_5fd626bb3f680.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/jejacjh/parachute_colorado_dispensary.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/5558032729.pdfIn PDF document text
    • https://menufepu.weebly.com/uploads/1/3/1/1/131163725/2301af72af30d09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_603f4295179d6.pdfIn PDF document text
    • https://cdn.sqhk.co/kisereta/1Aidygd/39935119408.pdfIn PDF document text
    • https://romudemul.weebly.com/uploads/1/3/4/8/134886817/7829452.pdfIn PDF document text
    • http://centerverifybadge.com/9981962547feu3i.pdfIn PDF document text
    • https://cdn.sqhk.co/numorolele/1giqgjP/71893547144.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/heiexhf/85332359095.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saboveliga.myartsonline.com/boss_ve_20_vocal_harmonizer.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/photoshop_tutorials_free_download_cs6.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/walter_benjamin_aura_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/44649276584.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/24723591826.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/xuwejijuzubi.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_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 5592 bytes
SHA-256: 62c2c7031c0828c3d6642301efb7618f4c693c1cbb424dbde5e03b94af452b66
font_01_sfnt_off00011538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11538 10636 bytes
SHA-256: 63e5d5f388932e02490441111eb02b5cd428feb5156bd86f438c18874a172263

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