Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6df0ac1fe7836d…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 02:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1744c85e02706179a6d96ae702cce759 SHA-1: 0a5c58dd329e15be4c7ec0561a4fa3f6e8df7e86 SHA-256: ea6df0ac1fe7836d2dd5d5160b8fd89c5d8ae36fb10eabf0880cc4ee5b456763
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating an attempt to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 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://ccskin.com/geektic/files/fazezakikugaseromawu.pdf In PDF document text
    • http://hai-bi.com/uploads/files/202109230924217879.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/42975023505.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/namurokezujifofobomejunow.pdfIn PDF document text
    • https://domilot.com/uploader/files/10594007436.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/14354358886.pdfIn PDF document text
    • http://ccadl.com/files/20210904160419.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/kimitebubobogusebisogobe.pdfIn PDF document text
    • http://youil.org/userData/board/file/jegigixituvivaniwuwa.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/27606737659.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/dalagipupukoniwumumude.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/15422450253.pdfIn PDF document text
    • http://cy2hand.com/userfiles/divopetofuxogiw.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/kofojoxukamadalevelunofo.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/netodo.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/34908916483.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/tuxigenode.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/guzumut.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/50208607536.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/wibidajogumu.pdfIn PDF document text
    • http://halmar.info/userfiles/file/lefibokevasiroxeloj.pdfIn PDF document text
    • http://apothepharma.com/upload/files/zuvekerivover.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/jurutulabelibel.pdfIn PDF document text
    • https://aleemanschools.org/userfiles/file/60895674278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=i+got+no+time+roblox+idPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04D 10452 bytes
SHA-256: 563a17c593028881a0adb50fedf92dd474f0d80e2929bb15f476e3ec5a5e7bc2
font_01_sfnt_off0000c7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B6 16200 bytes
SHA-256: 9722d9da1e3b77e12d394b02098c7df96c2e14b6862955aa7feac93095ec20f9
font_02_sfnt_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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