Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b1fa29d44d3619…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 15:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa729ea93864b001108f33995328463b SHA-1: aa8debd620f805a1d7b8bf1a394df77de43d27a4 SHA-256: f7b1fa29d44d361953f3b55244f4695b4d2aef51086f965db1259d6831303256
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a high concentration on disposable hosting, and a heuristic identified it as a link farm. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic suggest an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://heureka-cz.eu/files/58587922943.pdf In PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/jilixadonedexax.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/kopugofanijejaxu.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210911070226.pdfIn PDF document text
    • http://topstec.com/d/files/medezuzoz.pdfIn PDF document text
    • http://jinyezi.cn/upload/236659795.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/15772901827.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/tevizerotifip.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/kiwutu.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/96711647718.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-06/images/files/77198249424.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/83343599104.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/29546115555.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/miwekitupugen.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/fijibirizimugakazifigosud.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/56179570461.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/48730187843.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5bcd239cc---56953374588.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/16709287301.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/luzafefulezepibut.pdfIn PDF document text
    • https://krossi.ru/images/content/files/83708798125.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/xusezatazokisaroko.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/jeranosalapedamari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=new+version+of+minecraft+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_off0000bc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 16536 bytes
SHA-256: aa74874dac1a1371d5d7e6a39691df8eed0d0c47a52c4518b6ae312672df6596
font_02_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 10816 bytes
SHA-256: 2a43049d8aa4bd547eeb3290e498056519c73bc1c022ab3cc18dc7bde1818229

Open this report in the interactive analyzer, or submit your own file for analysis.