Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76e682e03bb5e98…

MALICIOUS

PDF

79.9 KB Created: 2021-03-22 07:29:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b163293adf2b4002140375f1fa5e5195 SHA-1: c4ed4cb839f50ac5f643d737783acdbd2873b554 SHA-256: e76e682e03bb5e98001a38a1a96fa2ee13d2bd6cf0aed2edb0946847d0aabf50
186 Risk Score

Malware Insights

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

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 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://fokemale.ru/123?utm_term=decatur+il+police+department+accident+reports PDF link annotation
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/lexusin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493200/normal_60462a3443d19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_602a716c135b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_600df3c110cfb.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/29073862033.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/jigefinibodilokiwubema.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/5949bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5fecaf459cb19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_603710c7de816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467322/normal_6035b7e393c33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403418/normal_6001f12b9910b.pdfIn PDF document text
    • https://jotipipadazazo.weebly.com/uploads/1/3/4/3/134319758/nezulasugugex.pdfIn PDF document text
    • https://jijoforupet.weebly.com/uploads/1/3/4/8/134864875/5092938.pdfIn PDF document text
    • http://sosunimepewe.22web.org/what_is_a_rhetorical_device_newsela_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451542/normal_5ffb3ccdc7979.pdfIn PDF document text
    • http://sovuradema.medianewsonline.com/dixukera.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/305b0762-60c4-461f-9308-f3e1ddf97751/carl_rogers_pioneered_constructive_techniques_for_working_with.pdfIn PDF document text
    • http://zukusuvajijip.epizy.com/infrared_thermography_seminar_report.pdfIn PDF document text
    • http://gapajafikotu.rf.gd/babosabuveguxunege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0961ef6e-eaa8-422f-beb0-5fe563787c5b/does_costco_sell_hearing_aids_in_canada.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 5220 bytes
SHA-256: 9bb5bfa098a2384e42c77f334212e922a303bbb49a21f3ddbe4ee4f1e7cd8d9a
font_01_sfnt_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 2144 bytes
SHA-256: 279c37fcabba51aac6d2da334e904db04caff73ea0fe0e33b42da9ccacbeb2f2
font_02_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 10728 bytes
SHA-256: 562511d381152163649dc3b033bfc0b83ca2218cd176bb8a10c04b0509f453f3
font_03_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 16880 bytes
SHA-256: 6ec229c24529a358c131ee313581d0f07f65b4fe3555c9b3ede32f1fcfcfb813