Malicious PDF — malware analysis report

Static analysis result for SHA-256 0345646a47f7279a…

MALICIOUS

PDF

73.7 KB Created: 2021-02-17 15:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: be652e4aa1a0f26238d0c768d8b29218 SHA-1: 8efe21bf173ec70fe9b97f822eb2c80375c09da5 SHA-256: 0345646a47f7279aa2879d70697b51775b7c847c525ef9faed59fc8145f07fa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to Weebly and other free hosting services, suggesting a link farm designed to host malicious content. The primary URL, 'https://jottigo.ru/wb?keyword=why%20is%20my%20hp%20laptop%20battery%20not%20charging%20despite%20being%20plugged%20in', is presented in the document body and likely serves as the initial lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/wb?keyword=why%20is%20my%20hp%20laptop%20battery%20not%20charging%20despite%20being%20plugged%20in PDF link annotation
    • https://sapilijufidukuw.weebly.com/uploads/1/3/4/9/134901451/133804.pdfIn PDF document text
    • https://zevigutuxokalu.weebly.com/uploads/1/3/4/7/134769804/977644.pdfIn PDF document text
    • http://prosale.company/acdsee_photo_studio_ultimate_2018_v11.2_build_1309vwhf4.pdfIn PDF document text
    • http://zumedemuruva.22web.org/android_access_root_folder_without_root.pdfIn PDF document text
    • http://islemleriniz.org/20768371948xrcjb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409610/normal_6009aa3d19a3c.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/litobesigavukego.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/asphalt_8_for_windows_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387712/normal_5fe01b252fd77.pdfIn PDF document text
    • http://bobr.space/33350732350ilczw.pdfIn PDF document text
    • http://onlinekartiadesi.com/alta_frecuencia_capilarvyyec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vosimalume/53559104068.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/apple_store_para_android_gratis.pdfIn PDF document text
    • http://fizojigijuzad.epizy.com/6924840357.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/tixefizotifizone.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/cardboard_vr_games_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/jasper_ireport_4._0._1_tool.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/12224652483.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/anualidades_matematica_financiera.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/yamla_pagla_deewana_full_movie_filmyzilla.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 5744 bytes
SHA-256: f0be7023697208c621dbe0f042c29532b0d524c2161b1d55194791865ebe9f07
font_01_sfnt_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 11352 bytes
SHA-256: e35e9783890cf4d678cb11b177005d8cde7f91f266aacf0dfda879e0219399fa

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