Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab81172a8aff867…

MALICIOUS

PDF

69.0 KB Created: 2020-11-11 13:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f964f46c96420a933a2b86022dd31836 SHA-1: 1325f2619e57dfebca9b473d88e60a7e67895fec SHA-256: 7ab81172a8aff867bf5e203ccfadac2113d4771469a0e29fa0b8553ccce62090
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?keyword=laxmi+prasad+devkota+pagal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404310/normal_5fa73fabbf903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5fa9ec0aefa07.pdfIn PDF document text
    • https://lawaxiwutaf.weebly.com/uploads/1/3/4/3/134356413/314888aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5f8e96b744700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378410/normal_5f8f2c0b805cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef151209-bca8-4038-8727-3664345a0d9b/58623493971.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/you_tv_series_2018_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5193365b-a303-41b8-ba6b-227ac786546d/u_substitution_definite_integrals_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/46521698336.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/zifevazegonagaboxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8190b700-0fac-4efa-aba8-bdd0670df715/saruvefofogezifa.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/82241560902.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC011 5412 bytes
SHA-256: ec7396bfb9d31518aa09e78c59771ae8e0c463d1d3ef3270c7dc33a5644993a9
font_01_sfnt_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 10532 bytes
SHA-256: cff3cc4d16eb2a073ebb4c7bbc18edc6bf75798c0921053063f7ea2c01f1e2d5
font_02_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 4448 bytes
SHA-256: 5e46d127ee075c14873119b385fb2d85ad21e1565eec5d6d1334c077833c7a6c

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