Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc64dd9fb2557581…

MALICIOUS

PDF

61.3 KB Created: 2020-11-30 01:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d7f6a07da689a13b0eab861c74f94f2f SHA-1: c7b9aa3583331d38d6dbd78a28557b924a73a287 SHA-256: bc64dd9fb255758114a6f8f75c814c14c6536920d5a983b6892d7915f6907d1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of embedded links and the nature of the heuristic firings suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://trafficel.ru/123?utm_term=crush+crush+12+days+of+balls PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f870006c519f.pdfIn PDF document text
    • https://jotinebemoti.weebly.com/uploads/1/3/4/6/134681432/fulep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414682/normal_5fa22ad346905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448980/normal_5fbbca5f20dfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f8bd91cd51bf.pdfIn PDF document text
    • https://bupigesow.weebly.com/uploads/1/3/4/3/134360728/5838128.pdfIn PDF document text
    • https://xipurewaxo.weebly.com/uploads/1/3/4/7/134759043/5676755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470405/normal_5fbb03f226d54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392869/normal_5fc34bc9452b5.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/c291f5cc-1993-469c-a8fe-0e20fa8e9818/99781237220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe0b562-bea5-401c-be67-96ef2199c0c5/zedubosexebazes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ce1cdeb-791d-4b9b-b756-29e167a54fc2/65017503574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06202753-79f6-487d-868a-6fc12c3405ac/planeacion_didactica_para_preescolar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe20843-2a62-4495-a849-83c3462546df/bluegrass_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e86c1c5-a5ab-4092-bebf-ca69dec0665f/aca_conference_2020.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_off0000b1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F7 5440 bytes
SHA-256: 46b44a2e6026db21c7f176abfc9972add78c869ce3bb0291c5a34838c8f161bb
font_01_sfnt_off0000c47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47D 10628 bytes
SHA-256: 7122b02f52bd83ab92047ff5b34fa18a278e79595f8c971c021fe360e597296c

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