Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe1693fbc6ab8ac…

MALICIOUS

PDF

84.4 KB Created: 2021-09-14 13:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e6d004c0c10ed4ffc0f59aba0322fdcf SHA-1: a2f2a247f0a0040ab6463ee78aec4572f4765645 SHA-256: 5fe1693fbc6ab8acb6057c75e9f0dfd628c622b62f16c8311fde209aa3257feb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that appear to be part of a link farm, with one heuristic specifically identifying it as a 'link farm on disposable hosting' related to downloading Windows 7 64-bit loaders. The presence of multiple unknown URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a183425a41f72eefd15b632d48d68718/1308145800.pdf In PDF document text
    • http://lyzebrno.cz/userfiles/file/lufupegenurik.pdfIn PDF document text
    • https://motoralbini.it/files/file/dasadis.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/94442934458.pdfIn PDF document text
    • http://feg.vn/uploads/files/xitulox.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/89833100588.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/55076293727.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/33975505989.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139529590a97---jelox.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/kedovolefodaba.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/kemabipubekaretixodume.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/puxulukaxul.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/47600027567.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/6244478357.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/56948543111.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/labagid.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/kagalibaferazelokedebitiw.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/kaxusikewemakerifu.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090602540623574.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/vibedibizositen.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/vejamunudobo.pdfIn PDF document text
    • http://citranco.com/users/files/lofogefu.pdfIn PDF document text
    • https://deepex.hu/hirek/files/12375551034.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/70180978255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=win+7+64+bit+loader+free+downloadPDF 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_off0000e26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 10696 bytes
SHA-256: d655bf49c57a26dd7d51966fae63087eaac9c2e510d5d3e72538086ae20768d2
font_01_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 18716 bytes
SHA-256: 868880331cea83e5ceeed790b6223805337f982c16799e082316fcb8f1342a17
font_02_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1