Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cfea4732b7d188…

MALICIOUS

PDF

69.4 KB Created: 2021-01-23 23:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2a2a235c6f7f5cb8a0c1726579e45b31 SHA-1: ea07b07989301a8bc8fe732cb570c921ab8c4257 SHA-256: c3cfea4732b7d188e4e47cec032428337dd7746d16244017fbb0d63141dce39d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or malware distribution attempt. The ML classifier also returned a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=my+zombie+myself+tone PDF link annotation
    • https://site-1176713.mozfiles.com/files/1176713/download_apk_jewel_hunter_lost_temple.pdfIn PDF document text
    • https://site-1253381.mozfiles.com/files/1253381/47798602293.pdfIn PDF document text
    • https://site-1173352.mozfiles.com/files/1173352/relefige.pdfIn PDF document text
    • https://site-1237297.mozfiles.com/files/1237297/26306605049.pdfIn PDF document text
    • https://site-1083792.mozfiles.com/files/1083792/pavufexoxuzogosubozexijig.pdfIn PDF document text
    • https://site-1171403.mozfiles.com/files/1171403/backtrack_installer_apk_free.pdfIn PDF document text
    • https://site-1252392.mozfiles.com/files/1252392/85005435274.pdfIn PDF document text
    • https://site-1176136.mozfiles.com/files/1176136/indirect_object_worksheet_for_grade_4.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/243816.pdfIn PDF document text
    • https://site-1248223.mozfiles.com/files/1248223/3195683509.pdfIn PDF document text
    • https://site-1177968.mozfiles.com/files/1177968/beethoven_silence_piano_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491946/normal_5fd30ee80164e.pdfIn PDF document text
    • https://site-1176228.mozfiles.com/files/1176228/wuxurezubarol.pdfIn PDF document text
    • https://site-1178554.mozfiles.com/files/1178554/vutisuvejoxib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zasegusof.epizy.com/80251351832.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_off0000d4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 4904 bytes
SHA-256: 94ca226114f84bb19a11e5d9337bd3a695675690ae087ad6c4e6155e221e5f1d
font_01_sfnt_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 10360 bytes
SHA-256: dee5df2509c1dcf85657dcb4ad4bc40159b36c28978f811e30b8b48876c4d26c

Open this report in the interactive analyzer, or submit your own file for analysis.