Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47404730820c005…

MALICIOUS

PDF

76.4 KB Created: 2021-02-15 17:25:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 941be3461ee8b6fbb05fac284f24bfc0 SHA-1: 17a20c56b75c35853647f25c68e9280190c91f55 SHA-256: d47404730820c005679c3282ba874532b13a461c979fc12bbca01034a2582bbb
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document appears to be a link farm designed to lure users to potentially harmful websites, likely for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=ashton+kutcher+baby+names In PDF document text
    • http://lifeshop.pro/lunibe2rixr.pdfIn PDF document text
    • http://lifeeuro.info/rumabwa2zf.pdfIn PDF document text
    • http://milesnires.xyz/buet_admission_test_question_2019_downloadtnjby.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417523/normal_600373f007308.pdfIn PDF document text
    • http://lefijuf.iblogger.org/waruzexudasuz.pdfIn PDF document text
    • http://xiledokujajipo.22web.org/tizereni.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuwudedi/eWiccih/download_legend_of_ninja_dragon_fighter_unlimited_money.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/widikuzaxirajademewaliv.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/1875496512.pdfIn PDF document text
    • http://jevigoxiferoka.epizy.com/busta_rhymes_new_song.pdfIn PDF document text
    • http://dokaxemimagi.epizy.com/bandlab_apk_file.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/50484902524.pdfIn PDF document text
    • http://gixisenusadat.rf.gd/25599477461.pdfIn PDF document text
    • http://konevimojo.epizy.com/ssf2_sasuke_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/vufiguje.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/coltrane_giant_steps_sheet_music.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_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 5300 bytes
SHA-256: 95ccf9012d8e49ae601146477e29ee0f6594b4fb95964562ea0a6b498194d068
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 11236 bytes
SHA-256: 33d736c3bcea52aad2a9596b03a6df46cf390c78c190f9267b2c530bf770b8dd

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