Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e546e21a4d8cf6…

MALICIOUS

PDF

82.4 KB Created: 2021-03-26 03:14:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4c8b708e453d9ce6c40aabebaaa1334e SHA-1: 10215368a24770d084156c0fddc1186d01f1d32f SHA-256: 15e546e21a4d8cf69075e2ff076ce50bbb6aae9a2d0879682a20da31f1365071
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://maypoin.ru/123?utm_term=instagram+stories+iphone+online PDF link annotation
    • https://jugivukovetid.weebly.com/uploads/1/3/0/7/130739525/06914274dced577.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/89353212015.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/omron_bp742n_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/ZhbgimR/health_disorder_definition.pdfIn PDF document text
    • https://poxesaxe.weebly.com/uploads/1/3/0/7/130738711/murufuxoxilowemoguve.pdfIn PDF document text
    • http://badoxik.scienceontheweb.net/12478145369.pdfIn PDF document text
    • https://kewidanuratug.weebly.com/uploads/1/3/5/3/135323433/xomakiximiji.pdfIn PDF document text
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/a82c96fc.pdfIn PDF document text
    • https://liwuvena.weebly.com/uploads/1/3/1/3/131398027/sagopetadofejo.pdfIn PDF document text
    • https://xitititoludazo.weebly.com/uploads/1/3/5/9/135987602/jawajituvakolus.pdfIn PDF document text
    • https://petirinupupa.weebly.com/uploads/1/3/1/4/131438611/jufunorekoxavibir.pdfIn PDF document text
    • https://mogefitinovodug.weebly.com/uploads/1/3/0/9/130969954/b38d4.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/uMjbeTV/62062167515.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/spoken_english_in_telugu_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/Y3nDAGQ/wubusivajisigew.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/konogisorapapog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/wanderer_above_the_sea_of_fog_art.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/vawuxiguxokunuwokitadapa.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/22881538564.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_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 5172 bytes
SHA-256: b063c15d259767c192ced64458f02c4aebcec9b0b8f0e7e9f5b775c1b3701870
font_01_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 2536 bytes
SHA-256: 98b29292b552a6497aa861c95df8afd892a89ed9430e2ad4fa8f4c428e49f43a
font_02_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 14672 bytes
SHA-256: 5aae9246f161c2d8ce22dcd6922125ba5d5df4e2f15a7a68ebe41994c9575f3c
font_03_sfnt_off000125a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A3 16344 bytes
SHA-256: c1804d1106ec531a9c887c87d3f6a693eb7a99a90d212860bc90d72627e8cb3d

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