Malicious PDF — malware analysis report

Static analysis result for SHA-256 815c04cc1f9087b2…

MALICIOUS

PDF

114.1 KB Created: 2021-09-20 22:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5759b11180d8fdab0ce65dde07cc6a4f SHA-1: 303f2b1e14e85f359805196334a45681fac2c2ca SHA-256: 815c04cc1f9087b21026c69a3e09206d0233d7d4e20df07c629dc6668c1e7dfc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to deliver malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=american+english+file+5+second+edition+pdf PDF link annotation
    • https://nocnepal.org.np/ckfinder/userfiles/files/rogekakunatafewaweb.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/99397884942.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/tazekimufer.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/nabiwinotu.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/87851640709.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/borexivamunefidil.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/54073879.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/27861737346.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/pogejamipokowibobudubo.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9dfef2a49---nadovofiwowomiru.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/vunatoruxebuwipe.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021918224858319.pdfIn PDF document text
    • https://mytopics.it/uploads/file/21692145094.pdfIn PDF document text
    • https://fond.ru/userfiles/file/mefonusakobesogunowi.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/rozofufut.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/rukixijogojumixik.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/gomude.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/miduger.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kuzabopazagolusenudoja.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/vevusasot.pdfIn PDF document text
    • http://koutingchina.com/upload/files/80129848948.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/14703644058.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/tetuxirijid.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/xenezigimoxik.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/33486687801.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_off000151ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000169fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169FE 20944 bytes
SHA-256: 62d3466618914eedfe3fef56f7d21d1657875fdf10c47945e20277708721aa96
font_02_sfnt_off0001a05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A05F 11184 bytes
SHA-256: d78246b15884a905e10722c3fdb590016a1486a7ac1997b2310835b96489346a

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