Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f913ae352b068a…

MALICIOUS

PDF

77.6 KB Created: 2021-03-20 11:10:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 551d2c60e203adbec0098a5f19c0e175 SHA-1: e0e6ce1e52fe04c0e8d8c2e3f17b4be5076c0ce9 SHA-256: e3f913ae352b068a3dc4e97fd00b94323b4c00017277370c259a7356b9d38b04
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URL 'https://pelibifir.ru/award?keyword=arcview+market+research+pdf' is a primary indicator of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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=arcview+market+research+pdf PDF link annotation
    • https://muwubuzegutan.weebly.com/uploads/1/3/4/6/134649477/a62bf.pdfIn PDF document text
    • https://musokuvezuref.weebly.com/uploads/1/3/1/8/131871850/5560808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_603795112b050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_6013487b51391.pdfIn PDF document text
    • http://wunedefewadonif.22web.org/why_does_my_tv_not_pick_up_hdmi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420776/normal_6029df096956f.pdfIn PDF document text
    • https://muxetomanudone.weebly.com/uploads/1/3/1/4/131406273/ruledile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_600c37fded609.pdfIn PDF document text
    • https://kazerefe.weebly.com/uploads/1/3/1/0/131070627/kuzikovelovonop_majag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/36fb9ead-fdd9-4b69-80d9-72cc531817d8/electrical_engineering_salary_out_of_college.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/wutupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff8693fd-0a34-4f7b-b5b7-836eedecd3b9/nupogolibulujulidalobul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a82180-f8ee-4fc8-ac67-521115724a6f/fifty_shades_freed_full_movie_2015_in_hindi_download_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/740b7883-b887-43e9-86df-dbbc2412e7dc/wujeb.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/deferred_tax_balance_sheet_liability_method.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75425e4a-3400-4f3c-bdd2-eeef3921f87b/43960623356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/618fc747-076b-44fe-9d03-7310ed115e94/panirezaxonesitapinader.pdfIn PDF document text
    • http://wuvubuwavozogaf.epizy.com/advanced_language_practice_key.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_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 5568 bytes
SHA-256: 4c55b367cac5917370cbc45dd2a4edc1f39b0f036fe4ad1daf7eadc3c69c2beb
font_01_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 10324 bytes
SHA-256: d3638ceb5c4d9508274570ae8eef800a41c88f4b66be3caea886b72e65b6cc60

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