Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75bb2c1953e23c4…

MALICIOUS

PDF

83.7 KB Created: 2021-01-09 17:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 83d1961328fa57938a21b20026dcb17f SHA-1: 906f76238b4955df4d210e6d13a9dd06850c17ae SHA-256: c75bb2c1953e23c4bd20fac09d4a8cf38c9e4c42cc4e8af7027739143f40cf51
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/123?utm_term=echo+show+8+manual PDF link annotation
    • https://zeleveruki.weebly.com/uploads/1/3/4/8/134898901/41b9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f8887189a166.pdfIn PDF document text
    • https://moxitimufetumo.weebly.com/uploads/1/3/4/0/134040580/459721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370088/normal_5fdd67f5efbcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393022/normal_5f94894297067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_5faef16d94b50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379971/normal_5f962f0367868.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/golipakumapelazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d072ae13-7ed4-43e6-8da7-da989aa5acf7/46728634497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf563aa-2f12-401e-8d80-779c46704fbb/valixujurelemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19bce527-0069-42e8-a18a-8cc2a74fdbad/40230846052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07459353-4751-49da-89ff-7591db630ae9/world_war_2_and_countries_involved.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d9c63b-ec57-4347-9ad8-2eadae62259e/divotiwem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dba9072-4c01-4cb8-a765-db78fe81f9bb/novela_manual_para_ser_feliz_de_que_ao_es.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_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 4824 bytes
SHA-256: ca8a7be1b9eebbcde8566595dcb3507dfcf586aa18e58079c68c410653ae1621
font_01_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 11368 bytes
SHA-256: f58e3c6230be40adccf1f277e199afc0714e57aa30900fa662c6b3a33b807dd7
font_02_sfnt_off000133cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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