Malicious PDF — malware analysis report

Static analysis result for SHA-256 beaad499de331db0…

MALICIOUS

PDF

70.9 KB Created: 2021-10-01 15:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3028046f4765f0153b2024f15f8bce48 SHA-1: 825539bb61b156b71d45cc8d374e9da16341eb7a SHA-256: beaad499de331db032bbf392067af622b969c43ac79454ead1c2252a4062b194
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct domains. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://prakseologia.eu/userfiles/file/bezorekina.pdf In PDF document text
    • https://himalayanthailand.com/image/upload/File/65593623671.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/68465535143.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/lidekuwobivusujuliwuvibad.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/77381994461.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021916157443124.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/zogopokavadisuwela.pdfIn PDF document text
    • http://eecca.stocker-development.com/uploads/ckfinder/files/kevidol.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/3289941172.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/lufuvasu.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/dipuxasoditejedene.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/50505418488.pdfIn PDF document text
    • http://moristas.com/userfiles/files/43090002962.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/74224725967.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/73299416505.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/zetefufaj.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/puzefo.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/fogefa.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/54446304757.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/pofapivevefabavijajewuri.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/jovenilomu.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/jigirigepero.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/vobusinisutanozarerasud.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/60107912007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=quick+shortcut+maker+pro+apkPDF 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_off0000b1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C9 16912 bytes
SHA-256: 5ac5b2cdfb9109d3183bc9d5ee023553663a08226335401158c7f1222613ecb9
font_01_sfnt_off0000dce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 10740 bytes
SHA-256: 4b627f091a5787593978bf03a9e9bf1e66422f493c7de7dff9df016fec55987c