Malicious PDF — malware analysis report

Static analysis result for SHA-256 99965529f3aea3bf…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 18:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fac4e160c7432a4f18db988187ec71ba SHA-1: 6064eda23ff7d45056ab8a430786f2d9740c4ec4 SHA-256: 99965529f3aea3bfd94b8808bcf07652804589e4799674aba5bc33be0f58f096
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters. While no scripts were directly extracted, the presence of numerous unknown URLs suggests a potential download or redirection mechanism, aligning with a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chrmglobal.com/userfiles/file/vevemetex.pdf In PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/xavuwenowodoreleve.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/58637614540.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/75033394291.pdfIn PDF document text
    • http://imi.vc/upload/files/86501694784.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/25728898219.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/xitiz.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/duzubopa.pdfIn PDF document text
    • https://euchebnici.com/img/file/naxebusinevigafibitox.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/zovujoxuvigimal.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/kogejudokuvokem.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210910005902_497350340.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/84639258837.pdfIn PDF document text
    • https://titishop.co/upload/files/komapezuzi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1026802vld303qm9rtheuse67e/3575381499.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/kipilebiviwobejaw.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/pomeletatoge.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/sedij.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/goburadupefivovoragob.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/64774258450.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/5300870944.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/laditugabivesobirul.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/96782826139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+do+i+open+a+zip+file+on+my+android+phonePDF 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_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 17024 bytes
SHA-256: 902da11b8a14802e5d716711b46b228a2ed692fd0a9f74ebdf76fa5b237f7166
font_01_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA5 10748 bytes
SHA-256: e799831bbbc6c34348264bb06a5df8088841b9566708eafe74dbdef6e12c42c3