Malicious PDF — malware analysis report

Static analysis result for SHA-256 d088c6b025c02bbe…

MALICIOUS

PDF

78.4 KB Created: 2021-09-11 20:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2eb1bd7737a47481dd85c862a14da64 SHA-1: 5a8ce82df5a381c19d33a0810bf8bd43b74cc0f3 SHA-256: d088c6b025c02bbe1551725a647582d62eb3c83e839894e524da7ba4ff08cec9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=how+to+open+avi+files+on+android PDF link annotation
    • http://madmojo.com/fckupload/file/5444851521.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/zowom.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/87988301394.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/65308825577.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/23585050088.pdfIn PDF document text
    • https://toocapen.com/files/81169693870.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/nafuribirawajaraneked.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/67059132231.pdfIn PDF document text
    • https://terracell.pt/images/file/pizonaxi.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/76346325150.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/vivunupumodevitedejatap.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/sagedakinisarenige.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109070410181520.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/13189971553.pdfIn PDF document text
    • https://qkon.ca/images/file/dazukevozid.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/duwilexawajomo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133c374cf645---nurotijemovigi.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/85138448091.pdfIn PDF document text
    • http://dongphat.net/upload/files/siderufesobatogenit.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/24746554700.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/50617208839.pdfIn PDF document text
    • 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_off0000cea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 10632 bytes
SHA-256: 20050429803d24d945877e897ab1845e00101d324358a6c50f43681d07d56fd7
font_02_sfnt_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 17384 bytes
SHA-256: 16d2014e4d9206d9b93496ee470b63e1474b69c674b688290bf53a9c1d927b95

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