Malicious PDF — malware analysis report

Static analysis result for SHA-256 741dc07ce4fdc295…

MALICIOUS

PDF

88.3 KB Created: 2021-09-15 20:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19aee67e3aa2f88c7d58420795c819bb SHA-1: 1926a6cbe6bcbeffeac549259fe2a02512d2ced2 SHA-256: 741dc07ce4fdc29552cfb5c1fd2a3ea1eb19ee0a0a93f6fdbbbbdc3f21a30b32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the sheer volume of external URIs are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=what+is+system+ui+on+a+phone PDF link annotation
    • https://stichtingech.org/ckfinder/userfiles/files/xerida.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/45747950236.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/pelorarazo.pdfIn PDF document text
    • http://builderall.info/userfiles/file/13461898363.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/fifojixatuw.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/wuxasezirifulimaxe.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/27327623953.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210914130307381.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/62210495419.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/78722132291.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/banezumizawe.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/94844757521.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/53452725529.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/82663966240.pdfIn PDF document text
    • http://dakov.hu/_user/file/41558076795.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af3f0acc2---84497351613.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/39033675359.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/22264283233.pdfIn PDF document text
    • http://qwerty.pl/_data/file/labakixorapokidinul.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/xokelokezajiwekibo.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/zegowakovove.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/tupusetesebuva.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/bafexufubawusapisajor.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_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 10576 bytes
SHA-256: 5e8a3a313d7fda555b43e269498c315da9e52341169f943e9eabf6413259ab83
font_01_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 18304 bytes
SHA-256: ec5b02d3fca9b51c90b04b9afa2d7459c867f0c490880d7eadc6b60df7abe0dd
font_02_sfnt_off00013b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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