Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49c53a895beab47…

MALICIOUS

PDF

77.5 KB Created: 2021-02-26 03:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a4331cfefe1825fc83fdfc035a9fd292 SHA-1: 6e9f9a1487086b6755cb1a2247cb72428bdcd102 SHA-256: e49c53a895beab472f93d2dab957157aeb2efdd780a26d703161738e9da172f2
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a phishing or link-farming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=maths+worksheet+for+class+3+addition+and+subtraction PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416934/normal_5fcd5449ba8d8.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/hejghhR/hitman_3_trailer_song.pdfIn PDF document text
    • http://filitopalanima.22web.org/straight_talk_mobile_hotspot_internet_not_working.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392869/normal_5fef8a89dc1e7.pdfIn PDF document text
    • https://cdn.sqhk.co/manowipete/ghhcUif/mini_jcw_challenge_race_car_for_sale.pdfIn PDF document text
    • http://vojidovalo.iblogger.org/kusedofevikazaxepum.pdfIn PDF document text
    • https://cdn.sqhk.co/ramejolir/JvXhczw/sebebafonukemetedef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fcfecfec4a7d.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/Ybz8Cjc/farm_bill_2020_details.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_60153c99c5220.pdfIn PDF document text
    • http://rotixumuzu.22web.org/astro_kid_english_subtitles.pdfIn PDF document text
    • https://cdn.sqhk.co/xegogeji/jhjhesM/wojijesijubawakumumunezi.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
    • http://lojetewope.epizy.com/tunadozuwu.pdfIn PDF document text
    • http://wipapirub.epizy.com/watajokuvukozuzaliwe.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/gopebu.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_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 5456 bytes
SHA-256: ca898f4d64c5edc0255921a590c51c2ccbd46e613625bbdd3cce3262b053a615
font_01_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 10396 bytes
SHA-256: 89d4a064d2493ccdaab0ba0e222c005aa61f421886eae0c36d92505ab9bebdbc
font_02_sfnt_off00011a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A38 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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