Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cb08bc711813d9…

MALICIOUS

PDF

110.6 KB Created: 2021-02-27 11:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: eabb0b3dcc9670861e5931171331384f SHA-1: 1c91fbf905b00a1cbac71d0569d08e4566f56b1b SHA-256: 73cb08bc711813d9135198ac94af6b2157b369598f340227744377d233b1b51d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with a notable one pointing to 'mezovuduw.ru' which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a book review, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/wb?keyword=wings%20of%20fire%20book%20review%20in%20hindi PDF link annotation
    • http://securespot.ru/15557120557vzjmi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427506/normal_5fcfebdc8b82e.pdfIn PDF document text
    • https://nuvaxavixo.weebly.com/uploads/1/3/0/7/130738964/2834fa9a541e73.pdfIn PDF document text
    • https://nalabusapigo.weebly.com/uploads/1/3/2/7/132740218/wuduludotus-xigikoxibaxuz-dutazujodukow.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/agatha_christie_movies_full_length_miss_marple.pdfIn PDF document text
    • https://sozuxope.weebly.com/uploads/1/3/4/8/134873608/975733.pdfIn PDF document text
    • http://cardioactiveuficiale.site/340943172346uil6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485305/normal_5fd6df58d1f22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415308/normal_6010977ec1ddb.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/79747934673.pdfIn PDF document text
    • http://naturmilans.fun/poughkeepsie_tapes_netflixbhpgy.pdfIn PDF document text
    • http://kasyanbeauty.com/molecular_biology_of_the_gene_worksheet_answer_keyal4qg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_5fe619d4d737a.pdfIn PDF document text
    • http://rizaxezo.iblogger.org/42691058240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_6023ee77b0e31.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://zijedan.atwebpages.com/obdlink_lx_wont_pair.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/how_to_reset_a_droid_turbo_2.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/geosystems_an_introduction_to_physical_geography_answers.pdfIn PDF document text
    • http://wojixefem.epizy.com/84392437587.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_off00015122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15122 5296 bytes
SHA-256: 48178992f645780f12dc10a789329d796f0a0f370d19da51ea339969f4e51e3b
font_01_sfnt_off00016342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16342 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off00016ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA5 11020 bytes
SHA-256: 758f90ad27ede1eb5d61fbaebdf4ebb22c1f74968931cdc17b8adfea538240dd
font_03_sfnt_off00019319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19319 6908 bytes
SHA-256: 9d52c01fb41eaaf9e74df509435db74ec16ff4e8fc77ffd58af7e9f682f290a5

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