Malicious PDF — malware analysis report

Static analysis result for SHA-256 e633815a6ca0b45e…

MALICIOUS

PDF

72.8 KB Created: 2021-01-21 04:19:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a24e65a48b67794bc6b38ea372503dc1 SHA-1: 0a5e597e2f6e60459bb72a29a93ab6c77168701b SHA-256: e633815a6ca0b45e224577013f757e0776b15fe45251dc3963201af5ef8b8372
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosting and utilizing UTM parameters, indicative of a link farm designed for phishing or malware distribution. ClamAV and ML classifiers strongly flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=bioshock+rapture+john+shirley+pdf PDF link annotation
    • https://site-1178096.mozfiles.com/files/1178096/68795680617.pdfIn PDF document text
    • https://site-1172169.mozfiles.com/files/1172169/gear_club_true_racing_mod_apk_android_1.pdfIn PDF document text
    • https://site-1206689.mozfiles.com/files/1206689/14959878935.pdfIn PDF document text
    • https://rokotejipap.weebly.com/uploads/1/3/0/8/130814190/xarobotasusifatar.pdfIn PDF document text
    • https://site-1174503.mozfiles.com/files/1174503/47947304420.pdfIn PDF document text
    • https://site-1197027.mozfiles.com/files/1197027/85368479651.pdfIn PDF document text
    • https://site-1175385.mozfiles.com/files/1175385/squadra_fast_and_furious.pdfIn PDF document text
    • https://site-1173903.mozfiles.com/files/1173903/71532388810.pdfIn PDF document text
    • https://site-1214630.mozfiles.com/files/1214630/birthday_invitations_templates_for_free.pdfIn PDF document text
    • https://site-1185743.mozfiles.com/files/1185743/vifegezigukejotibolak.pdfIn PDF document text
    • https://pezibife.weebly.com/uploads/1/3/4/3/134376528/406211.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gebibem.epizy.com/apc_ups_es_750_manual.pdfIn PDF document text
    • http://peworesafasar.epizy.com/89294632058.pdfIn PDF document text
    • http://runapapaxezupow.rf.gd/glencoe_geometry_chapter_10-_8_answers.pdfIn PDF document text
    • http://nejowubixulifud.rf.gd/collision_reporting_centre_brydges_street_london_on.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_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 5536 bytes
SHA-256: 63982f12da9db08fb53abec73a4602eea6be9991ab6f0b4324a91e5ed92e5daf
font_01_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 11244 bytes
SHA-256: 6094b96591a9c4b4a8b16861bd964f13be290117b48143716cd144ce7996487d

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