Malicious PDF — malware analysis report

Static analysis result for SHA-256 450dc9164c4faa73…

MALICIOUS

PDF

77.3 KB Created: 2021-09-09 13:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b653df3580afcbf147cfa2801676a2e9 SHA-1: 676ea44a441403f76e0de5140ad4bb11f967ec3f SHA-256: 450dc9164c4faa734b56281f9f08cc6214002001f924354b2f76cdbc2904ffc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting an attempt to redirect users to malicious content or phishing sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate effort to create a network of disposable links, a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mextro.de/upload/files/70488585435.pdf In PDF document text
    • http://wxdyzs.com/userfiles/files/17317313559.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137984c450bc---retakikavukixoto.pdfIn PDF document text
    • http://hidramaco.com/files/files/66609829546.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/morukulajivatala.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/15285305432.pdfIn PDF document text
    • http://abwva.com/uploads/files/75496524430.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/94890449892.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/xiterobodupajodasilim.pdfIn PDF document text
    • https://isleo.com/i_photos/file/winisifaw.pdfIn PDF document text
    • https://x-software.cz/data/file/pusasoxoduvusunixideveru.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/21817291881.pdfIn PDF document text
    • http://artospace.com/pics/file/60340103910.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/xefagewala.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/45658374336.pdfIn PDF document text
    • https://ottopianos.nl/files/tojevovivid.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/xifibakij.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/70190865777.pdfIn PDF document text
    • https://onlinendttraining.net/files/16341649351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=c+major+scale+notes+guitarPDF 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_off0000ca02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA02 17540 bytes
SHA-256: ace4da98191d20ebdb829c30874f729437af8c5ea2953e1317528d9f4109ce7d
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 10832 bytes
SHA-256: 9c978b4ee95ae011fd952fdd35907b0526df28b60a7094a74eb97f1f60b70b50

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