Malicious PDF — malware analysis report

Static analysis result for SHA-256 11454b09ccd90cb9…

MALICIOUS

PDF

75.9 KB Created: 2021-09-15 10:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f477fe509c211096f1a8f1d2beab40a5 SHA-1: 1c7de8358f017e5c0f6a8969e1ce0a11bc846253 SHA-256: 11454b09ccd90cb9feb9f5ec169bfa2bf166c00de437c64aaf167b4e68e00a4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the document is designed as a link farm, likely to redirect users to malicious sites or downloads. The presence of numerous embedded URLs, many pointing to unknown or potentially disposable domains, supports this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sowiik.pl/userfiles/file/busaragoboga.pdf In PDF document text
    • http://sanchariglobal.com/userfiles/file/gepikodevodozolezeke.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/37241025904.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/81400922379.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/somususeduwofipirasuvibob.pdfIn PDF document text
    • https://buka.ru/sadm_files/fatifujetudafivomexumijam.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/jotatug.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614119520fe3d---notagesokizanojo.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/mubefoxotuzixemibi.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/10018853361.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/49098053371.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/34230871136.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210909_CEC47C8F9BB08BEC.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630508584.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/8924514008.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/guteler.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/75003368142.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/53493392462.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/potazifa.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/feromidumevurawisanuborex.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/5806409829.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/13560848329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+simcity+hackedPDF 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_off0000c39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 17532 bytes
SHA-256: e70bce47d3ba0c789be465c089d911b6e330948c0cf8f73e0c1b79fc4c924993
font_02_sfnt_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 10828 bytes
SHA-256: 7149d7352f8974dea33aa05c88f223b4297101c3490a0b865bc4ed391d49f57d

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