Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7349fac08a3d31b…

MALICIOUS

PDF

135.6 KB Created: 2021-03-20 18:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f12ae8c5d3c7c20ab3d7e4d6a16ee88b SHA-1: e319e3133cd94b7aef855ece905b9d59f9cad598 SHA-256: b7349fac08a3d31bc03e29d6ba11c0446ae7f22287489ca270dd1dd7387789df
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. The PDF contains numerous external URIs, with one specifically pointing to a suspicious domain ('pelibifir.ru') that is likely part of a phishing or malware distribution scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support the attack pattern of luring users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=axial+chirality+pdf PDF link annotation
    • http://wiinorama.space/new_animated_movies_released_in_2020023im.pdfIn PDF document text
    • http://p-kavkaza.ru/kubernetes_pod_template_yamldyotg.pdfIn PDF document text
    • http://damvglaz1.xyz/803832733986l0qn.pdfIn PDF document text
    • http://naturebiolog.fun/what_is_the_meaning_and_example_of_literary_nonfictionnzcq4.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/bass_guitar_minor_scales.pdfIn PDF document text
    • http://donbetosstreettacos.com/why_is_my_mr_coffee_pot_not_brewingegv70.pdfIn PDF document text
    • http://card2card-perevod24.site/blue_rose_flower_images_free_hd1u5l3.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/convert_kindle_cloud_reader_book_to.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/a_arte_de_amar_frases.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_170eb169d80f4fbd835aedba0c4ded55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89014816-d255-472e-8bdd-f15a5e6807e9/electrical_engineering_jobs_golden_colorado.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/95352226432.pdfIn PDF document text
    • http://dafuwinev.myartsonline.com/harbor_breeze_ceiling_fans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d518bae2-7dac-45b8-b7bb-617b1fbfee5b/16974949683.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/29303271472.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/12676546113.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_1e6c7610787947b9a509c9912152177c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41120f82-9ad8-4c6c-b906-6fe3ecf02f86/xodigijinenoxanivap.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001be32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE32 5224 bytes
SHA-256: ec354a81b5a2c0025fc6836e1f3af88fc5780b490ac34d09a3c1f3c02fe1e63d
font_01_sfnt_off0001cffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFFE 13740 bytes
SHA-256: 32c72d9b619060fb60c32811d7669c126d70ce0a9dea4265fcdded0d68ac374c
font_02_sfnt_off0001fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBBC 16176 bytes
SHA-256: 67c74aae60ff6fd5bad1a219db8f3574a455316ec28acdc0ab437c962480e0d7

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