Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e87df806221e832…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 04:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73d830ef1f3b227480e8b3bc951e5e34 SHA-1: c505a2a190c4bfd7dbb5e652aee1501ac65fda74 SHA-256: 1e87df806221e832064c9e4deb117a9b5bc78dcc378b071d303f266712876c13
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. The heuristic analysis identified it as a link farm on disposable hosting, containing numerous links to PDF files hosted on various domains. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to direct users to download further malicious content, likely through a phishing or social engineering pretext.

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 http://bratislava.topenglish.sk/app/webroot/gallery/files/15694920856.pdf In PDF document text
    • http://antifftech.com/uploadfile/file///2021090501381196.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/52796419241.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/94416192868.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/66085415043.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/56469560450.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090310513173499.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/4333007929.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/16666344069.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/27737740277.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/37975659503.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/damamosozulupafogi.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/48506413876.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/kokuzamakubigimafapi.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/ligurudefejijedobuw.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/verugikekujijodiviwa.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/ponizofekugemokagalewa.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/rozunopabijopamusikeli.pdfIn PDF document text
    • https://krossi.ru/images/content/files/57493604158.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/kapotati.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/kasovepotivevixafabaled.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/83239186832.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/vifinokizaram.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/dovasojid.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/92148404865.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/51540573376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pvz+2+mod+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_off0000e2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AA 10152 bytes
SHA-256: cb87f56c953cb9781e7a5963c43d53d5f931e62c272d18722062c71779c2f610
font_01_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 17420 bytes
SHA-256: be1df03a89793c6bee2490b1a8fc9f17e32bc050144be9bd402303faffcb23f0
font_02_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1