Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ff43648f33bfc7…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 20:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c7c39eb1b35e0f34c8d4e8f06f355fe SHA-1: 7aad87acd933f5a2fcc65ad1e8c4869ad4b2f42f SHA-256: 90ff43648f33bfc71dfeecd6416fc33500106161f70738241eea3f1b696b6530
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, including one that appears to be a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs indicate an attempt to redirect the user to malicious content, likely to exploit them further.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=lawsuit+answer+template+pdf PDF link annotation
    • http://antitumor.org/filespath/files/20210907010351.pdfIn PDF document text
    • https://5uempat.com/contents/files/1126929634.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/60541994849.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/15519069696.pdfIn PDF document text
    • https://infypos.cncmonitors.com/infyposcms/media/74819801765.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/2095877272.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7447141108.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/tunupitasevujekesasoti.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/polisomupalawobuxafuvok.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161377d260cf7a---wogojexekuwixe.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/kabafuv.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/21113227428.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/77834330610.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5e7b9ae5---tolipawumawi.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/lifozumategivusexepogagog.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/65776413601.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/58662478176.pdfIn PDF document text
    • http://shopabrang.com/images/files/nesitijujamejuxavifita.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/50237030224.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/nuvaxibofiwalod.pdfIn PDF document text
    • https://superchills.com/userfiles/file/64375859642.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/mawoda.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/lijuwob.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/49960949259.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_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 16796 bytes
SHA-256: 0eedd4daca1f2778ad23ab90620d79a0f81c869b4d8ffb158ca4bd5de694efe3
font_01_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 10680 bytes
SHA-256: 96c835ccd73ad1d91495f5116faa3e57e951db357b259574f21a04b8f40e88ad