Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7617fff30578a19…

MALICIOUS

PDF

92.4 KB Created: 2021-09-08 22:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e61c963a37b53d8d2b0658b7fab4365 SHA-1: f17ed0724f82ca95d32305f6c38ee32819a8d85d SHA-256: b7617fff30578a1966bbd70bffc7cb9449001120ff713998b60f95c05f490c6a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are part of a link farm. The 'SE_LOLBIN_RUN_COMMAND' heuristic suggests the document may attempt to execute commands, likely to download and execute further payloads. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/89178276386.pdf In PDF document text
    • http://gadkowski.pl/repository/filemanager/file/78832684074.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/vivujapovufuxisakagojav.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/ligifeb.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/62503682483.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/lavuledire.pdfIn PDF document text
    • http://alcantara.cz/data/file/16568075521.pdfIn PDF document text
    • http://qdcmd.com/data/files/vejufipazuzub.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/16391658166.pdfIn PDF document text
    • https://unaizahic.com/Files/files/tananigusuvawodifok.pdfIn macro / runtime command snippet
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/bowamu.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/82825148021.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/muzuboputedereritubebe.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/10de6c536a384973363411199d4833b3/jenirokasilufe.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/tapuvajagugufori.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/rododaxunuzifogezaxakam.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/lafuzatekubewakogipusad.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/kiwogixeguwotefoka.pdfIn PDF document text
    • https://sharenkon.com/files/mepodunapavapugisarudetoj.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210902042424_hun4lv.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/57283891716.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/93247281526.pdfIn PDF document text
    • http://seasonmediagroupIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=aladdin+full+free+moviePDF 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_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B2 10396 bytes
SHA-256: a85af96b03e41daa652566a755e00778ece1fb56790f5ed2b40c49e396c94e68
font_02_sfnt_off00012f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F21 20460 bytes
SHA-256: 4e8ca364a9cde70788c3eebe4f8d564dc36d9d0ef3923a3f5801069054562971