Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b0901419cfbad4…

MALICIOUS

PDF

74.8 KB Created: 2021-06-13 01:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d98f384eb5bd37b50d6ee5a9ea7af76d SHA-1: ad7839ba5458cd8b92b9f0030889747cd050074b SHA-256: f5b0901419cfbad4fe1d30592a1a85f30d4dc3a90915743d22ba16b08be275dd
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a high concentration on disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded URL points to a suspicious domain, further supporting the malicious classification.

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://crysiq.ru/pbw?utm_term=86+kilos+in+pounds PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478125/normal_603a63fa82ac7.pdfIn PDF document text
    • https://kerusovaxi.weebly.com/uploads/1/3/5/9/135978613/3b5e6ff2.pdfIn PDF document text
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/c6a0d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373788/normal_5fc7a53081acc.pdfIn PDF document text
    • https://pudewufaziv.weebly.com/uploads/1/3/0/7/130739775/541086931453.pdfIn PDF document text
    • https://sakifawabepufa.weebly.com/uploads/1/3/4/4/134466371/fuwowufobenupip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_6066295c612ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_604342ac9ee5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9823b885-d2c1-4f75-b423-63c26d615de4/the_book_of_unknown_american_essays.pdfIn PDF document text
    • http://mivegaz.pbworks.com/w/file/fetch/145111911/88084706906.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/tabazonademawitef.pdfIn PDF document text
    • http://mokapuv.pbworks.com/f/6894105097.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/w/file/fetch/144413796/80242083762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28498044-34ba-4c3f-aa4c-8b8186616643/jisedogijulukawi.pdfIn PDF document text
    • http://nosegawibaso.pbworks.com/w/file/fetch/144516813/96431522032.pdfIn PDF document text
    • http://posonuxe.pbworks.com/f/cowboy_bebop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fddd84f2-3139-4619-875d-5f5c2a96be52/imaginarium_train_table_dimensions.pdfIn PDF document text
    • http://mivegaz.pbworks.com/w/file/fetch/144723213/how_to_make_a_dunkin_donuts_french_vanilla_iced_latte.pdfIn PDF document text
    • http://mamejoniza.pbworks.com/f/grammar_translation_teaching_method.pdfIn PDF document text
    • http://nimulivupale.pbworks.com/w/file/fetch/144734205/statistics_unlocking_the_power_of_data_solutions.pdfIn PDF document text
    • http://xinunubaz.pbworks.com/w/file/fetch/144852897/nifis.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_off0000e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 4964 bytes
SHA-256: a0c969163f4193c5a70f752606b3f89dac397ff7132371eb9891a317156f9db7
font_01_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 10252 bytes
SHA-256: 14f1935744e2463d100943fa08c764ff3ebf5fd2014c26686a916fa892dc1e63

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