Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ef8c9989c9dc54…

MALICIOUS

PDF

70.3 KB Created: 2021-03-13 16:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e83d87f105ba2f52aa4599149c20f162 SHA-1: 8a5aed1c8fd1f352c13d171d815dd1230c6b56b3 SHA-256: 80ef8c9989c9dc540ec5352618b63c34e938d2ba63283d87a8a9cd38d991afd8
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many on disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution attempt. The primary malicious URL identified is https://jumiwimov.ru/strik.

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://jumiwimov.ru/strik?utm_term=us+army+corps+of+engineers+vicksburg+ms PDF link annotation
    • https://goxufosoxewuje.weebly.com/uploads/1/3/5/3/135300646/sitozujaforasifu.pdfIn PDF document text
    • https://vogexuweju.weebly.com/uploads/1/3/0/9/130969932/8855219.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/centech_5_in_1_power_pack.pdfIn PDF document text
    • http://sikevemekoma.mypressonline.com/47279578354.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/a1d22.pdfIn PDF document text
    • http://filuxunokenobud.mygamesonline.org/alpha_urdu_word_meaning.pdfIn PDF document text
    • http://pifanaliriwabo.mygamesonline.org/zekobeputofatinegebuzize.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/jotul_f_600_review.pdfIn PDF document text
    • https://kadezejuvi.weebly.com/uploads/1/3/4/6/134603763/vuxibomipopiri_jijufagoron_fudanoba_punitap.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/how_to_put_strap_on_polaroid_onestep_2.pdfIn PDF document text
    • http://xaduwojitodefo.66ghz.com/3355812438.pdfIn PDF document text
    • http://legugoboxebepe.22web.org/flash_actionscript_2._0_free.pdfIn PDF document text
    • http://sotinifox.22web.org/12106875155.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zujugefov.rf.gd/10th_maths_guide_2019_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665207df-cc66-4f7e-926f-0341aa860e69/on_writing_the_college_application_essay_sparknotes.pdfIn PDF document text
    • http://metiguwuwezaza.atwebpages.com/32207254373.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/70142125604.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/rikubix.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/bole_chudiyan_video_song_1080p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0168b54c-73b1-47ea-92a5-9be72781359c/how_to_prep_for_sat_math_2.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_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 5660 bytes
SHA-256: 66bd28611b583e085f02e33496efa8c8549b3618c0d6e1c6f279409f8a9a6d90
font_01_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 10460 bytes
SHA-256: a48b31d5adcd68bfc31eb9a72de49978269a24f0d52dc5ed90eff963facb0e73

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