Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58e951c95704f0e…

MALICIOUS

PDF

78.7 KB Created: 2021-03-19 17:08:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b468aa752e1ed22f0e70bcd3bf40d3c3 SHA-1: c8644dc81bad215d860fd3dd21cd8fc8ce87b214 SHA-256: b58e951c95704f0e443cbde4da6443ae4af704f6bad53fd0b5e67115d11f94c3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or SEO abuse tactic. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely attempt to redirect users to potentially harmful content or manipulate search engine results.

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://dugedepap.ru/wix?keyword=abiotic+factors+in+the+coastal+ocean PDF link annotation
    • http://copytoshka.ru/55173727589rn9cr.pdfIn PDF document text
    • http://sevisotesasare.iblogger.org/88684432158.pdfIn PDF document text
    • https://cdn.sqhk.co/dulinifijal/he6iawb/fusavagulugavujoke.pdfIn PDF document text
    • http://womenit.space/vefopowulopiraj9twmc.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/XUhexgf/hackers_2_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_601d5fc9cc0ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370780/normal_5ffa0c4d4c498.pdfIn PDF document text
    • http://xobukafa.iblogger.org/churrasqueira_americana_char-_broil_performance_convective_440s.pdfIn PDF document text
    • https://cdn.sqhk.co/jujijodop/bhgSjbV/sibubipolikuva.pdfIn PDF document text
    • http://khareedforosh.com/ieo_set_b_answer_key_2019-_20xfyhk.pdfIn PDF document text
    • http://triple-doska3.club/neoclassicism_and_romanticism1d2tb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_aa01f27edaa64fcfbddda56cae87197a.pdf?index=trueIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_fe38c1f8abb44be589d1912329b03895.pdf?index=trueIn PDF document text
    • http://kiralemosokeze.epizy.com/alimak_lift_manual.pdfIn PDF document text
    • http://vuxazobug.rf.gd/free_download_harry_potter_audio_books_in_hindi.pdfIn PDF document text
    • http://xanokilil.rf.gd/el_camino_de_sherlock.pdfIn PDF document text
    • http://mozutebileba.rf.gd/apocrypha_and_pseudepigrapha_definition.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_7a90d79aa3454888a3982948990e0cb7.pdf?index=trueIn PDF document text
    • http://lomuwobutuwadim.rf.gd/bootstrap_html5_form_validation.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_03f083a54b3f4b69b09e8d009e7bf259.pdf?index=trueIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_010386dbf73847dd855442e0428b6aa5.pdf?index=trueIn PDF document text
    • http://genoropafetado.epizy.com/23249632192.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_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 5100 bytes
SHA-256: b5f7a4755d85aab1bc472bd2ba382a475da622deef37706a819f32170ffbbf4d
font_01_sfnt_off000106a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 12120 bytes
SHA-256: a2c1dd247c67da9f0f4878ed51226b4c38d05bc4288d363d843b1f3e2b69b1bc

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