Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6213982717e48b…

MALICIOUS

PDF

72.5 KB Created: 2021-09-19 17:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 053620af590abfd0648f7d98f03f1971 SHA-1: 4cb03caa1e4bbbf534a3308c1424e2e27449b468 SHA-256: 7b6213982717e48b946565d375a96003d72804eab1a0ccc076ae4124a6857078
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, and one directly to an IP address, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=pes+21+for+android+offline PDF link annotation
    • http://rqconsultores.com/userfiles/file/16061208630.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/51518335023.pdfIn PDF document text
    • http://espicycooking.com/files/file///viwunigajizaxexemu.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/walugemaxuzoxiluzeduvu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aea73be62---5840792117.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tufilupitiserukuvezozu.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/40445605918.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/71242138626.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/vevufu.pdfIn PDF document text
    • https://profm.hu/files/file/61707458734.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/95633117999.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/93f231a9e58366c11df4907a55e10514/45108036210.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/63884813112.pdfIn PDF document text
    • https://rcot.org/userfiles/file/gisezem.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/65536903040.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/detaraduvo.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/37302150696.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/14640033156.pdfPDF link annotation
    • https://www.leasing.net.in/ckfinder/userfiles/files/19385150088.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3309992208.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/47913859416.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/zajusizavuxifidubobaruku.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15832852295.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/10892490123.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_off0000ba22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA22 16360 bytes
SHA-256: b1e9c4b3afcd4b680e470c58123a3dc4b7c08ed3bae934b7710f02da6333d23e
font_01_sfnt_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 10420 bytes
SHA-256: f97a5ed345f5c831a15487598216fe4060a2b60fd896d54fed502cfd53b97bd7
font_02_sfnt_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1