Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ee897b3d8ecfff…

MALICIOUS

PDF

77.4 KB Created: 2020-12-27 09:01:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d26e48da0cb7aa13f2f0b0fe86060dac SHA-1: 69f1a0a5d2fbbd211f69c2aa28b4264ff936b150 SHA-256: 91ee897b3d8ecfff85a5639bd4972307e685c5f664b9331efb15ac06cc0dbcf0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

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
  • 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://trafftec.ru/aws?utm_term=boat+and+chair+conformation+of+cyclohexane PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405650/normal_5f927ac7cc45c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451754/normal_5fc1f3365fa36.pdfIn PDF document text
    • https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/zenemerefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fa61a9bb4419.pdfIn PDF document text
    • https://xufidevudog.weebly.com/uploads/1/3/4/3/134389214/f97bf.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/dc62df3d-4d85-46c7-b8c4-7beced6cc6eb/35477676530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd0268e-4476-462b-a49b-11b1f392495b/18974055309.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/ccm_skate_fitting_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8e5550-3f54-4861-85c3-2dc16fd01572/usd_261_school_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d702ec-f974-4054-8ca9-3dae67feaf74/74139682451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4759a3eb-68a8-425c-baaa-7c077be9d013/zaner_blosser_font_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6537b40-e892-4269-884c-5d45854c5b3b/72160112971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2877a4a8-a4a7-4c4f-b402-8b8b82e2b78a/vudakugekejawe.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_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 5304 bytes
SHA-256: 5d88c65cb6ba81de35dad4492b93d48a315545f255c461c5be841ba4216b1548
font_01_sfnt_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 10804 bytes
SHA-256: d57752abd10925ddcbba5b4cabd7a7ddb56b6d7601d7701d3f51954bea7537c5

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