Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4ef525711b9ee5…

MALICIOUS

PDF

70.2 KB Created: 2021-09-11 12:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63af99db66b1ed1c399131ee51ddf7cc SHA-1: a080b4b26aa9aca90c9edebed9dfcf13bdfef8c8 SHA-256: 2b4ef525711b9ee5c0522b739535be3bc388ac26b962900ec4597031809fddc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to link farms and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://boki.hu/editor_up/85875750926.pdf In PDF document text
    • http://cartopack.com/Images/file/zipanefopusujuridugasuvi.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/61757745095.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/zemam.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/gidojaxosome.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/pusiwi.pdfIn PDF document text
    • http://lactopad.com/uploads/files/13975519921.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/jujuxitipu.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/vixana.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/gorosere.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/wubokeritivurewiwewune.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/dimegaxijadikiruzofaxovoz.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/kujujogimul.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/30876931318.pdfIn PDF document text
    • https://harmony.im/userfiles/file/3892356501.pdfIn PDF document text
    • http://amdind.com/userfiles/file/navafos.pdfIn PDF document text
    • https://hse.tw/upload/file/68777843281.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210904_C662D2AB40FF9616.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/janufatenu.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210908224738.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/lidimilewamivumoxasudof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+pubg+mobile+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_off0000b3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC01 10532 bytes
SHA-256: 30f7c05d5c8c0fb90e79fb83f2577ed37929ccfb55cb713dc3d67a2127bf86b4
font_02_sfnt_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 15692 bytes
SHA-256: 5948f9c67f84b213a992593291126daca380a4925b99ad773a31d168d245f2bb

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