Malicious PDF — malware analysis report

Static analysis result for SHA-256 e875b4e90d93cef3…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 10:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fbf38479be78c32fe1e87b01348cbb1e SHA-1: 412769c0edd9f16770c0dc9582d3e89401fb5e51 SHA-256: e875b4e90d93cef35e9272f4812e2c13b28b699726c01f6f03c7a83364048590
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a probable phishing or malware distribution attempt. The presence of embedded URLs suggests the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=pets+at+home+apk PDF link annotation
    • https://delaneyllc.com/ckfinder/userfiles/files/gevibajexemedeju.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/25108507597.pdfIn PDF document text
    • http://cssh.es/img/file/vavubet.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/45709898354.pdfIn PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/33497660119.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/tatudelewijavu.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/70134723274.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/zuzeduwosupejowesimojig.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/bisubamewamomababefosoz.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/boniwo.pdfIn PDF document text
    • http://keramann.ru/uploads/files/sejeniwisijorufu.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/79198805502.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/bepevevunur.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/41269241950.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/57809925494.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/58163967112.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/7428470188.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/jerekafanurepixiv.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/57089355505.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/wowimetunir.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c6a2b85fb97c18e2862079dc31e16f8c/boverizifow.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/xokenutudefukuxerowiwoji.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/86535364999.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/sedexozib.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_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 21464 bytes
SHA-256: 732f6754a0aba10781d727a9c714095a4bd10425a13badee0e7ef0edd9909c66
font_01_sfnt_off00011c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 10268 bytes
SHA-256: 7e58d881550196943964d470f5e08c296935c131b9db8bd3b51511cf571922ec
font_02_sfnt_off00013388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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