Malicious PDF — malware analysis report

Static analysis result for SHA-256 998856106082ad7e…

MALICIOUS

PDF

87.1 KB Created: 2021-04-17 06:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: abed72d8d92bd8b32f479913d2198725 SHA-1: 9108bfcb664e24167f85d4efa6e3169bdf141459 SHA-256: 998856106082ad7e2eb324904f554b1efa2b6c9b84a991956f88ffeccf06a784
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary malicious URL identified is 'https://bologen.ru/strik?utm_term=is+the+4moms+high+chair+worth+it', which is likely part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=is+the+4moms+high+chair+worth+it PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476925/normal_606c3c6ca8fc6.pdfIn PDF document text
    • http://strapslap.online/chandramukhi_movie_full_hdg4wud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_600cbf180f479.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494868/normal_5ff3013de0c3b.pdfIn PDF document text
    • http://xiwikene.iblogger.org/17232690117.pdfIn PDF document text
    • http://stroymarketmetal.ru/a_streetcar_named_desire_set_design8ktq6.pdfIn PDF document text
    • http://reduslim-italiaofficial.site/5106708905766zmb.pdfIn PDF document text
    • http://vizit.store/849598164953ukpt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_2c425bb57f534f52aa5cc5a50fcc4b09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xokebore/jilanuvaxawumupivejekepa.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/una_forma_de_comunicacion_no_verbal_es.pdfIn PDF document text
    • http://fuvoxibid.epizy.com/what_does_light_relief_mean_in_social_studies.pdfIn PDF document text
    • http://puwomuf.rf.gd/baiju_bawra_movie_all_songs.pdfIn PDF document text
    • http://waxusumuguk.epizy.com/22522400559.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/77951413085.pdfIn PDF document text
    • http://fonaxipovun.epizy.com/rrb_cen_01_2020.pdfIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_d83da2dc1d85430a8af8c971e200bc3f.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_103e6cedcbb34f9faac9217452f7dcd2.pdf?index=trueIn 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_off00011684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 5296 bytes
SHA-256: bfcabbe8ff7b3733c6b06ab45b86c95e3e04857adff40ba91aec300c0ddde3cf
font_01_sfnt_off00012877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 11520 bytes
SHA-256: e00c479adf25e11a69b539e1da8c12b72352bdaa2f2451bb3d97f09ea9d5b5fa

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