Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0ca6843d62640a…

MALICIOUS

PDF

88.5 KB Created: 2021-03-19 05:33:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 654a012625e81ff49bc15e9178e4e096 SHA-1: a0a624c2eba8e8077dc9d690cd59e50a7f5c7226 SHA-256: 8e0ca6843d62640a62eae20694761b5d04147682a499f159895c1b0aa7a3ee79
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=what+is+critical+thinking+explain PDF link annotation
    • http://lebedugipul.mywebcommunity.org/mekoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487186/normal_6039688c423c5.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/36180778640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_6020aa0835734.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/99124783293.pdfIn PDF document text
    • http://didibemez.scienceontheweb.net/cbse_class_10_english_syllabus_2020_20_download.pdfIn PDF document text
    • http://p-kavkaza.ru/11949207609810vm.pdfIn PDF document text
    • http://xelamoxadavas.mywebcommunity.org/rumijowog.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/whirlpool_refrigerator_ice_maker_replacement.pdfIn PDF document text
    • http://filfex.ru/somozofonexuxjl7cg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465559/normal_60223d940d5e5.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/skilsaw_15_amp_7-1_4_in._circular_saw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_600f03f2a374b.pdfIn PDF document text
    • http://wowmarket.info/70679890595681jb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424036/normal_6006edd9bca7f.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/mokixetat/calligraphy_practice_sheet_generator.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/harry_potter_-_hogwarts_castle_3000_pc_puzzle.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/jesus_the_healer_church.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
    • 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_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 5340 bytes
SHA-256: 2ab85d5d48a13436d21b14dee5eb92432ab9f344243c7aeac3643a35d95bf942
font_01_sfnt_off000117f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 11244 bytes
SHA-256: f0c3e4d18e05e2773fccca06107e3a1d6f388c1a6b52fe4b0e66f29b0c252cf1
font_02_sfnt_off00013da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA4 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61

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