Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bc819003fd9aa9…

MALICIOUS

PDF

90.8 KB Created: 2021-03-28 17:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 370073e4fb5e00b2d76f0f5c95bbeaaa SHA-1: 169121e9042c67f2f1c4b55999f724f3a69fd700 SHA-256: 51bc819003fd9aa9ca5e82c78c14479c16d8b443a093ff7b263739dd97ea7422
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that redirect to various websites, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and 'profile form pdf', aligning with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=vyapam+profile+form+pdf PDF link annotation
    • http://gufutaca1.xyz/adding_text_to_photo_android1aahl.pdfIn PDF document text
    • http://uscreditmonitoring.info/is_the_four_agreements_a_christian_bookir2h8.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://digakegenuses.iblogger.org/how_to_reset_jabra_evolve_65.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/FvqhgEO/lejibowut.pdfIn PDF document text
    • https://cdn.sqhk.co/woxiwokujuwe/gdjgXji/horror_escape_room_games_unblocked.pdfIn PDF document text
    • http://posadukik.getenjoyment.net/54587273896.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/hT4gghe/7690276185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_6027e9781dc98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_6021a31de8d27.pdfIn PDF document text
    • http://tozemudezajif.mygamesonline.org/error_analysis_articles.pdfIn PDF document text
    • http://neojust.ru/12704373339i4pxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5febfcfda7617.pdfIn PDF document text
    • http://islta.fun/bagowudalijisugexr7kaj.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/Nijeihe/68230388784.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369329/normal_6004a2e9ac4f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://zokaramizixa.atwebpages.com/mezowe.pdfIn PDF document text
    • http://riveminigokoxa.myartsonline.com/45814634630.pdfIn PDF document text
    • http://wivifizurata.epizy.com/21640923730.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 5076 bytes
SHA-256: c9890da3af7ec7fb3de58b8d6ecf6adfe45f346d950aa6a7e065234babc207a8
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off00010b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7F 11148 bytes
SHA-256: 262c94c71072589f35cf7af99981e4113b81e26a326b42ce87786e260f759f57
font_03_sfnt_off00013196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13196 14736 bytes
SHA-256: 5309dbda3a7799ab78af32bf63a4f07caa7aed599f641973e47f888d4a40a4d0

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