Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ce9107f4a6e3be…

MALICIOUS

PDF

87.5 KB Created: 2021-02-18 22:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ef81df0675bbe100dc72effc662ef5f8 SHA-1: 2ff66e3279fa2f054b1a1da7ba91b93049a6a0df SHA-256: 48ce9107f4a6e3be145065229c0ae5c9dacdd38a832c600114ff6cb15892f86b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to PDFs hosted on various services, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution attempts. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=how+to+calculate+the+break+even+point PDF link annotation
    • https://bonikelebosobi.weebly.com/uploads/1/3/2/8/132814552/kazofemurazowuvek.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/Jhjja4A/jixono.pdfIn PDF document text
    • https://zorovapi.weebly.com/uploads/1/3/2/3/132303286/afb677274.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/jh9pcWr/12034859667.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/37417496489tub6g.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/hClZAjj/3d_printed_pinball_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/7AvjjXv/fosafanowetamo.pdfIn PDF document text
    • https://xabisipejerifo.weebly.com/uploads/1/3/4/6/134634854/vafupoverawaju-gepabodepemigal-xamuz.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/gizonukorad/revitubigugevumimu.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/answering_the_phone_in_business_english.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/mowedoxovigenitat.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/81794573494.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/cayman_islands_immigration_amendment_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/saxifupuwarigunewu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 5160 bytes
SHA-256: c757fc9600c99b9ba55df5296c2b20c05da337eca1c0882c50e6276fa415994e
font_01_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 2628 bytes
SHA-256: 119b8fc2dbcf1867288a84b92befa09366f0aad5612e6cfbcb2315103e615a97
font_02_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 10744 bytes
SHA-256: 8b5c2042009efbf198b52ca95fdd1364c1c7177b22996b23fe325ea43e2780ce
font_03_sfnt_off000138a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A2 17456 bytes
SHA-256: 8c7afbf28af9ba93e5ccb0ed91555f6ce41bb957db6219243aa5e23238d4a865

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