Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b89b323d5f89f60…

MALICIOUS

PDF

81.1 KB Created: 2021-03-31 00:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9d6f6f160bdeae584832a00866a066ba SHA-1: 56ee95b233fda6fba6b7fd495fb0458ee7752da7 SHA-256: 8b89b323d5f89f60024a20c8cf4bc12056d054196a19b3db35bcdfdd069da39e
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 0.9995

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://kuzutuzo.ru/award?keyword=united+states+centers+for+disease+control+and+prevention+pdf PDF link annotation
    • https://cdn.sqhk.co/sibamoxa/ecHPhGA/pawamogomiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470232/normal_60201a853baea.pdfIn PDF document text
    • https://xebeluxowupud.weebly.com/uploads/1/3/1/3/131384709/342873.pdfIn PDF document text
    • https://fusodozot.weebly.com/uploads/1/3/4/0/134096428/zudupujebed.pdfIn PDF document text
    • https://cdn.sqhk.co/javepuju/iheiiha/90571363197.pdfIn PDF document text
    • https://kuxevirajopar.weebly.com/uploads/1/3/5/9/135990570/rujexizutijoxelofuta.pdfIn PDF document text
    • https://lurefeti.weebly.com/uploads/1/3/4/6/134683691/bozopefuxojusev.pdfIn PDF document text
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/mewulo_kudakuvoges.pdfIn PDF document text
    • https://wumaluruporemad.weebly.com/uploads/1/3/0/9/130969386/8365074.pdfIn PDF document text
    • https://wuvepadin.weebly.com/uploads/1/3/4/7/134714831/ea5509.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464722/normal_5fec06a602224.pdfIn PDF document text
    • https://biduvokiket.weebly.com/uploads/1/3/4/3/134367510/6741260.pdfIn PDF document text
    • https://cdn.sqhk.co/mizipudi/sihdYjj/86148956397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_60288ab47dd99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482424/normal_5ff247b19ab62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1a411573-7765-430d-ba0a-6b7293d6a5b7/tuloriluguxudinavomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8303929e-96f6-4644-8267-a1c839cdbf21/rafifudimunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3c6b8d0-8e8e-47dc-90ff-d4e5ac6c706e/bosch_300_series_washer_detergent_tray.pdfIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_4a69c17d4bdb4589b0ceb9af43b79b01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c1aec11-8ae8-4130-8d7c-e9f4f9097159/sap_hana_enterprise_cloud_customer_edition.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_3eeca30d398f40109d3182566cff3371.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1e939c-b4ea-43cb-a889-e601e24d8f1d/new_york_map.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 4988 bytes
SHA-256: 6e967004fd12f01dcbccada450ea80279213af5488765f4aa96b31d27f673170
font_01_sfnt_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 10700 bytes
SHA-256: cd100c826916a37ef6f5eb9bf86a031627aad79d73aa74b9264cdc6ef4425773
font_02_sfnt_off00012861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2