Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e54d7686fea0838…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 01:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eae3758ecb96020c5cbc1c30bf67d994 SHA-1: 6f57f02884b317570ff25a5ae6484e11ea3ab2e0 SHA-256: 2e54d7686fea0838e21e6e8338b98b891d5391ab9545c501fc7a657c013b17e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the overall structure suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=avatar+the+last+airbender+watch+cartoons+online PDF link annotation
    • https://virtualpulse.eu/UserFiles/file/82384949815.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/17630014070.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/19670365877.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/31050367337.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/95473633394.pdfIn PDF document text
    • https://ckmandarin.com/uploads/rimujemegaxavirawi.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/79930629474.pdfIn PDF document text
    • http://jainfarms.com/uploads/duzilikagobemon.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/jinetekigubejobubenuzon.pdfIn PDF document text
    • https://nexapos.com/upload/files/55200675040.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/86103264148.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/bulefalazobidasi.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/67108884915.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/86265588311.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/gezetinunesebofosigifug.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/6977412775.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/vaxajuf.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/2000380201.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210906221311.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/pegivafuludemenu.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/gukeleg.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/virojevafujakefurizesixa.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/82224140632.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/zinobonuj.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/kedalusatazagaraxig.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/sumibuferifiji.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://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_off0000dd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 18240 bytes
SHA-256: 824120ccb38e90d71b93c2de89f03a1dc7f8a82213662ae59a75fe3a53b9799c
font_01_sfnt_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001246e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 10740 bytes
SHA-256: f4474617d8cd4f9a6d50747e98d6bc61c7230706faa4d317d4592f5b9570b943