Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda97aab7bd7c5f0…

MALICIOUS

PDF

66.6 KB Created: 2020-11-26 06:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 530654cdcfa0d87f19c6fb7e24bfdf3d SHA-1: 10b8ae74d78ceb04d705d1b2308ed93085a2efdb SHA-256: cda97aab7bd7c5f0598736faa988488b4a3aadae122d3005182e4649ade02920
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 0.9998

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://trafficel.ru/strik?utm_term=oakleaf+bearers+pdf PDF link annotation
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/mawafukutopopomu.pdfIn PDF document text
    • https://mosunenipotope.weebly.com/uploads/1/3/4/7/134767451/bdb03d101108.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/1d171f.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/28ec4.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/pofafege_xubamo.pdfIn PDF document text
    • https://xoxuluxikodo.weebly.com/uploads/1/3/0/8/130814296/poviritipixaganaba.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/30656372-8bf2-4be0-8c00-b8ab49ec6f2e/bajupulajow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7099f660-7bec-476b-9654-49ff9d648247/how_to_tune_a_banjo_without_a_tuner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/590c084a-90dc-4744-a8b0-40efb1d68e2c/1.5_30_as_a_percentage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a624e8-d8da-4e92-b70f-22a4511cbee7/chatham_county_ga_property_tax_assessor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c871f5-78f9-4cec-80a9-498f0c8c7da2/modelo_atomico_de_dirac_jordan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d50fc659-8451-4ea1-849c-5b787708c95b/28164318177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc8ce86f-6e5a-4908-af1a-2067c26cda49/speech_reflection_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eafb524-4761-46e7-881b-3174b39960c8/66864176472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a54033d-314d-415d-9921-cea7ee731ee4/soduxuwewuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481e3035-1d48-4f72-9f2e-dcf97765e36d/zonodakofofukesunesotelup.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_off0000c897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC897 5264 bytes
SHA-256: 1b196ce5d8e67ccd474b52a9febd1e207671ada413a955aa771e7886afba0eb7
font_01_sfnt_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 10312 bytes
SHA-256: c3e945101b24687f85bc771ffc45c944944999f83756e4f0d9e12ddb8bebec4b

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