Malicious PDF — malware analysis report

Static analysis result for SHA-256 894d58b6173c42cc…

MALICIOUS

PDF

78.2 KB Created: 2021-04-20 14:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89b07b6d44ccfa302bee5f0cd7d0195e SHA-1: 997a06d7b99d26d533eed902b1eb0bb1cd7d7743 SHA-256: 894d58b6173c42ccbc0eae215e04b5dfa98457af36e7545f57c17268f83c837c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files, a technique often used for SEO manipulation or to host and distribute malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=three+phase+transformer+calculation
    • http://italywom.space/tegafatixokufebisopy5n93.pdf
    • https://static.s123-cdn-static.com/uploads/4418167/normal_5fe1fe48e77f5.pdf
    • https://jokasagumejede.weebly.com/uploads/1/3/1/0/131070006/kujotarofuxiwipoz.pdf
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/gizigo.pdf
    • https://bopevifobomamak.weebly.com/uploads/1/3/0/8/130814579/fukojekazawifal-lubenokesasizem-dinupade-vimotapisovu.pdf
    • https://fatagodudun.weebly.com/uploads/1/3/4/3/134327877/zapuzog_pabes_takam.pdf
    • http://xewodatesuporob.mypressonline.com/american_english_file_2_second_edition_workbook.pdf
    • https://cdn-cms.f-static.net/uploads/4480387/normal_5fd2c91a2c1ec.pdf
    • https://cdn-cms.f-static.net/uploads/4393624/normal_6024528b6c391.pdf
    • https://cdn-cms.f-static.net/uploads/4501794/normal_603a0387ef734.pdf
    • http://nedavupagisezim.mygamesonline.org/35725978881.pdf
    • https://tozowibalap.weebly.com/uploads/1/3/4/3/134383498/9058166.pdf
    • https://cdn-cms.f-static.net/uploads/4365555/normal_60317683c6ab1.pdf
    • https://cdn-cms.f-static.net/uploads/4474750/normal_603e404dede9f.pdf
    • http://izzzaaa.space/lusadarerisoredak1dwzc.pdf
    • https://cdn-cms.f-static.net/uploads/4413238/normal_604c97d0e2e21.pdf
    • http://xufuxenu.mypressonline.com/36129901175.pdf
    • https://cdn-cms.f-static.net/uploads/4374848/normal_6041569181a3c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_f632917a24a74e0ebba25f04e9b195ad.pdf?index=true
    • http://pezefaxovojole.atwebpages.com/38876512613.pdf
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_6ada2e5743694c1eb682fbbd76de83ef.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f526.bin
dc3e3288bd0c3622a09d284fbd725a0441ab3676341b0b07eccdd6a99477a779		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 5204 bytes
font_01_sfnt_off000106ae.bin
dcfb0866d552e3a749630aaaa85bc9d242531e6c69af6ac5dfa639cbaad35db0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 10780 bytes

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