Malicious PDF — malware analysis report

Static analysis result for SHA-256 b127a86c739db3e9…

MALICIOUS

PDF

77.4 KB Created: 2020-12-25 17:09:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f3c9adf861a9c953df45511cfe4c5370 SHA-1: 9291b8fb4480fa307e00eb56b87ac1e519099d02 SHA-256: b127a86c739db3e93e9128103936d05353ac60c3e32bc86ce19675e42e774bda
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=pharmaceutical+calculations+15th+edition+solution+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392442/normal_5faac6535732c.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/AgifgdS/beli_pulsa_dengan_gopay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475999/normal_5fcdbc231160f.pdfIn PDF document text
    • https://litaxavuve.weebly.com/uploads/1/3/4/8/134848922/6312922.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/fijigd6/amazon_add_images_to_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f88614a02eca.pdfIn PDF document text
    • https://pozuxopukemo.weebly.com/uploads/1/3/4/7/134705319/tubejiwozon_rokivaxutu.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/bb3b7843-08e2-43ff-afdb-15c6665639e8/mowurijewimikagujijaven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1672040a-80ea-453f-9362-2d48da884466/padi_adventure_diver_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468c09bf-1a5d-41c1-ac21-956c44509315/the_power_of_a_praying_wife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec552b03-032f-4a02-9087-65c049519f66/recursos_literarios_el_conde_lucanor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ff697b-0269-4f00-9817-8f2b2bb566e8/wimesud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff5934c5-7b7e-4ad0-a11b-681e8a46b382/65447541119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7596ba4f-7f2e-44f6-a18a-b64584d763a0/83877738210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfc24aac-8733-4182-88ce-08413f4e5418/xiroturab.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_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 5572 bytes
SHA-256: 2785f2222c4bcce503fa6ba7031b1532a84884be9de0ce3242fb901eddde098f
font_01_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 10840 bytes
SHA-256: f29143cde64687e007effb7e2895de1908e264ca1709d348c9e526a9edacb50e

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