Malicious PDF — malware analysis report

Static analysis result for SHA-256 de187641daf7cbea…

MALICIOUS

PDF

68.9 KB Created: 2021-03-21 12:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2ecc0da7cf3c5be01db67d01c5ba35e5 SHA-1: 0503d343190f5bcf4c0cb1d3b736ef8d722f6179 SHA-256: de187641daf7cbea32287c564e9fc1347ddf9500c5fb0f060851e99b4cb97676
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary URL, 'https://soxebez.ru/wix?keyword=definition+of+derivative+worksheet+doc', suggests a lure related to educational content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm points to a coordinated effort to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://soxebez.ru/wix?keyword=definition+of+derivative+worksheet+doc PDF link annotation
    • http://gramnews.xyz/terapi_cacar_airl56t9.pdfIn PDF document text
    • https://bowukobi.weebly.com/uploads/1/3/4/7/134706413/xusiwofod.pdfIn PDF document text
    • https://jopazidavasuzu.weebly.com/uploads/1/3/2/6/132681438/doludejuwuvesoxaxix.pdfIn PDF document text
    • https://cdn.sqhk.co/pinebiven/jTKwfgg/jokizagasosa.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/buwafipajofasi.pdfIn PDF document text
    • http://afracheat5.xyz/gaguzamerijanoneriwejo79ihv.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/AIy3ghr/33066948850.pdfIn PDF document text
    • https://rirumuzog.weebly.com/uploads/1/3/4/1/134109041/996e9.pdfIn PDF document text
    • https://poxofosu.weebly.com/uploads/1/3/4/3/134308827/e110e55c074e081.pdfIn PDF document text
    • http://edapog.online/32121648996e9oq6.pdfIn PDF document text
    • http://excellent-spb.ru/separation_techniques_chemistry3431v.pdfIn PDF document text
    • http://prosale.company/costing_sheet_tcode_in_sapq1tjw.pdfIn PDF document text
    • https://tobapedez.weebly.com/uploads/1/3/5/3/135344168/6980ce64d1864.pdfIn PDF document text
    • https://xigobelez.weebly.com/uploads/1/3/1/6/131606473/xizejomu.pdfIn PDF document text
    • https://tidevaxapoled.weebly.com/uploads/1/3/5/9/135971763/6315495.pdfIn PDF document text
    • https://manabuvajej.weebly.com/uploads/1/3/4/8/134847277/5021063.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/fujadabez/adobe_reader_9_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01110aca-d003-4fdc-8ddd-83538beba813/26068265011.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/reading_comprehension_worksheets_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/napexib.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/70815165670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/698ac635-ebe0-4844-a4f2-6987d6454d70/92332229650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc4653a-3920-4523-8bb1-9b4b880d9a1c/what_is_average_household_income_in_toronto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d14cd5-712f-4150-90ae-ab4f0b7e8ec7/how_to_use_the_dorian_mode_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/how_to_explain_theory_of_relativity_to_a_child.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_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 5292 bytes
SHA-256: 5cedf02897c7292587708ad8e7e1d296e76f52bdc3b3bb66348811b466bd20f5
font_01_sfnt_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 9824 bytes
SHA-256: 8d2db48713b40648dba417cc69b9491cd65f76026b646eef870c0fee150501ff

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