Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c112c78a74b504…

MALICIOUS

PDF

80.5 KB Created: 2021-02-26 03:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74ff376d214af58dfd46c7837f33174a SHA-1: b9b9a84fa8349609d6e59e30b0c23311b49ec578 SHA-256: e0c112c78a74b504110121797862c4b247d29eba3c1937255f62e9db6fb77ba1
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism for malware distribution. The document body, though heavily obfuscated, contains references to 'repair manual pdf' and 'wkhtmltopdf', indicating a lure to download a malicious file. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware delivery attempt.

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://seumenha.ru/wix?keyword=2016+honda+pilot+repair+manual+pdf
    • http://xijulefabogi.getenjoyment.net/pavefivaruwifutivimak.pdf
    • http://zegoves.22web.org/fraction_division_word_problem_worksheet.pdf
    • http://xuzerujagojagip.scienceontheweb.net/gefumuvafosodirovebalasa.pdf
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5fe6469493592.pdf
    • http://zekojotewakugag.mypressonline.com/eyelash_extension_course_jacksonville_fl.pdf
    • http://vipadobotisituz.mygamesonline.org/99377196884.pdf
    • https://static.s123-cdn-static.com/uploads/4505687/normal_5ff65a41829aa.pdf
    • http://warixedivukinat.mygamesonline.org/introduction_to_data_science_rafael_a._irizarry_solutions.pdf
    • http://pixunune.sportsontheweb.net/74244354687.pdf
    • https://cdn-cms.f-static.net/uploads/4474720/normal_601d358c23ec9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://miloxagiwe.epizy.com/xexujarutidimuxuxuzulaxo.pdf
    • http://mojofukiw.epizy.com/84279057941.pdf
    • https://s3.amazonaws.com/nazekisigiduz/dutuxelaje.pdf
    • http://kepofif.onlinewebshop.net/vazuv.pdf
    • https://s3.amazonaws.com/pegozegi/kaspersky_antivirus_free_for_windows_vista.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98e.bin
b5386c82805a33d0ae922564e49630aa7e8d6c250f0cebeb7e90778c29bd6082		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 5488 bytes
font_01_sfnt_off0000fc0e.bin
01b84bf0a13e1de2364516099fb5d782d8d4e5e73b612f32c45420c9475923ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 10184 bytes
font_02_sfnt_off00011f3b.bin
8d0ca5441952925faa6f68d28470995fcd5e3edd800b1977fac83179433ae1db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3B 16136 bytes

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