Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d7dc7d80a6b726…

MALICIOUS

PDF

76.2 KB Created: 2021-04-08 02:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 550cffac680643aca895036b8d690256 SHA-1: 9af5aa08601a9d7c848292fd7969d997a8af8cc0 SHA-256: 49d7dc7d80a6b7265673a71afb1db53ba28ba1263e253bd140215464599f3acf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=estructura+del+texto+argumentativo+tesis PDF link annotation
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/6623796.pdfIn PDF document text
    • https://riwaxetonebena.weebly.com/uploads/1/3/4/3/134363930/bazajixilalunebi.pdfIn PDF document text
    • https://bagerinev.weebly.com/uploads/1/3/1/6/131636948/tomukovepavilu.pdfIn PDF document text
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/97fc3f10a2.pdfIn PDF document text
    • https://voxonororipesap.weebly.com/uploads/1/3/5/3/135383222/galixivotud_dovad.pdfIn PDF document text
    • http://waludojugemupa.iblogger.org/tratamiento_con_hipoglucemiantes_orales.pdfIn PDF document text
    • http://lidagejelotodu.22web.org/63981023260.pdfIn PDF document text
    • https://cdn.sqhk.co/papebikuwi/ojiJxb5/tornados_food_shop.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/bdcK5Cn/kosoligosagezijamusaxodo.pdfIn PDF document text
    • http://kinatoguvekajux.22web.org/bawobedu.pdfIn PDF document text
    • http://numidib.22web.org/puduvixariniseketozonu.pdfIn PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/5852709.pdfIn PDF document text
    • https://nimosawi.weebly.com/uploads/1/3/5/9/135982357/terakewosotem.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/9e986fdb-e37d-4e09-a1c7-5e75fd6c87e5/sixilakotal.pdfIn PDF document text
    • http://beruraxawiloga.rf.gd/bitupamofedajogana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d4c296-0f92-4050-9912-2ae1c8b2fc2d/47402840646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02179153-37a2-4ef3-aa9b-15c3fca115b2/63048165624.pdfIn PDF document text
    • http://jonegukum.epizy.com/bikidujakasafewidav.pdfIn PDF document text
    • http://koxevopigi.epizy.com/math_u_see_algebra_2_answers.pdfIn PDF document text
    • http://bekogizob.epizy.com/adobe_flash_animation_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7923fc33-df29-4e66-9687-3836a5d4e84a/32850663373.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_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 5344 bytes
SHA-256: 2b4496e3706158919ceb420c58212f2119bf7cddbe8b4a851e87167b5776247f
font_01_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 11456 bytes
SHA-256: 96d322dd2fed351b8c9ebc9be68a04340e6322dde108fa718906dfac55c23149

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