Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46860b1e65228eb…

MALICIOUS

PDF

78.9 KB Created: 2021-09-08 12:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37c1601fd8e06b44b43367e5ccefdc3f SHA-1: 106f859012ab92afc78cc3940f08232c993a3820 SHA-256: e46860b1e65228eb6d77576548406175a593e29e0440ac5ebd8239a6b637915f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest a malicious intent to redirect users to potentially harmful content or further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://tecksco.com/upload/files/65919929278.pdf In PDF document text
    • http://sushimura1.com/uploads/files/bibujozalezedago.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/gununowebosokapilakaj.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613421a298d8e---gewanukow.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/36953176707.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/vegadujijisalol.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/nolobifofunivimebunoti.pdfIn PDF document text
    • http://aven.su/userfiles/file/30698954753.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/duxozu.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/17640502715.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/15645632217.pdfIn PDF document text
    • http://flomojapan.com/upload/files/lavifexeki.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/5109593979.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/32355978659.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/73334532447.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/magizidox.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/lubezamo.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/morivojuta.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/jekubukojidozusiwidu.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/41445571648.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/gularabodumev.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/74381158655.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/fuvixe.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/viluzamuwomow.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210902235353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pert+and+cpm+problems+and+solutions+pdfPDF 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_off0000d1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CC 16452 bytes
SHA-256: ecf72b9e276017ae35492135b9ce442858ef865d1bd43ae30e8328d45486d6a6
font_01_sfnt_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001146a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146A 11020 bytes
SHA-256: 2f04efcbf9d4e0ec67e343dfcac907fcf1ca62adce43ba51757107e288927083