Malicious PDF — malware analysis report

Static analysis result for SHA-256 4425c6722d818b4c…

MALICIOUS

PDF

82.4 KB Created: 2021-03-19 13:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7702291d35607caf9992a17f596ff1d7 SHA-1: e6174c9588dbbb29762efa288f75fea6ac62741e SHA-256: 4425c6722d818b4c5f87f021a4af9bd57489ff9dd439a8505df53ca9a1b19b24
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 0.9993

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://crophysi.ru/strik?utm_term=what+penny+stock+will+go+up+tomorrow PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369491/normal_604cf2c55df7a.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/formato_de_arrendamiento_de_vivienda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_6010062a882f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424637/normal_601379d06516f.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/dexabi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500444/normal_5fed0841c3c73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_603c19758e12a.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/how_to_write_3_body_paragraph_essay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403948/normal_6003b3dac39c0.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/mla_paper_format_example.pdfIn PDF document text
    • http://wusokamojifel.scienceontheweb.net/cytology_notes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411273/normal_5fdf82d791f32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_5fd136245843d.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/47500914902.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/miramupilobuv.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/74401174785.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/92292cf8-5087-4b37-b279-314229f76cf3/equivalent_fractions_worksheet_grade_5.pdfIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_2d6c26fb97bf472b9ac242bb01f9f540.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3414b5-597c-497a-bedb-adfafa81cb24/tom_clancy_ghost_recon_breaking_point_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb330888-cd0f-493a-9c24-f5455b8b875e/63488616841.pdfIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_0713ca561c1d4a0dafdfdc688776263a.pdf?index=trueIn PDF document text
    • http://rigidafavubo.myartsonline.com/23617655621.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_a2d02fa56e764b92b0d2e2e4fdda2d82.pdf?index=trueIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_62774979520a48ba835dd15919b361cd.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_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 5620 bytes
SHA-256: e45af1136d45ff6bff229792628fcf010d24c12e7b4b20f313605f1193b08cd8
font_01_sfnt_off0001169e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 11080 bytes
SHA-256: ea9b812841fc0282071215912ab279a25b1d5aa8de5ba7226b447c9df3ba7d6d

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