Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e3e853fc850930…

MALICIOUS

PDF

75.3 KB Created: 2021-09-24 10:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4167739d01c1206cd7d7003d0bfcd61 SHA-1: 619fd6025c17ecb424eac506105c693d4f423003 SHA-256: 73e3e853fc850930ab1b46c208f5beb89a56fa577dd88f14ae1100f3fdf60f2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and numerous external links point towards an attempt to lure the user to external sites.

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://pielinks.com/UserFiles/file/degebatoge.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f136c0c33---fuwifovibozuki.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/63736472059.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/98662999838.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/pizugefajexixi.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/zulekiriwo.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/65004013195.pdfIn PDF document text
    • http://slipa.site/0429/upload/files/19376049946.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/32948473087.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/73401435978.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210923232043949389ge45v.pdfIn PDF document text
    • http://poultech.net/d/files/gunedajidazagidaberezaw.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/73072560729.pdfIn PDF document text
    • http://spbi.cz/res/file/dubotofago.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/pirefezexu.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/71652213437.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/rufozeligozobibojokel.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/21790381563.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/75070131201.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/julupitexobetaje.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/xinulitokegewefefanebow.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/pufojete.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/lipemifitetogixibolobod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=leave+the+door+open+mp3+downloadPDF 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_off0000beba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBA 18480 bytes
SHA-256: aecfd0c31e407df009e321c11590df41e467d3965627fc19d0c628c0a70ceedc
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 10676 bytes
SHA-256: 26e14642b05d159abcbb4560e0a5c085e76dd957877145a8fd7d8649d540e048

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