Malicious PDF — malware analysis report

Static analysis result for SHA-256 255a6a6ef0b43d28…

MALICIOUS

PDF

65.0 KB Created: 2020-11-25 06:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ebd0fa57d7bbbde7029b73ccb5c40d6d SHA-1: d7d739494d9039118a0ed57f98da3988abcc0f37 SHA-256: 255a6a6ef0b43d2897baea08da7259c24ccca86c60242479753eeda59482eb6a
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=marapets+battle+guide PDF link annotation
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/f539f9e3c543a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_5fb4fb1e193c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f89d2b10e0d8.pdfIn PDF document text
    • https://vapuwunenerupig.weebly.com/uploads/1/3/4/7/134727873/balapepeg_vodopakutitatev_tanigugu_gafoxelikuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451757/normal_5fa37c35e788d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_5fa86a5d97280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f94ab5e8e3ba.pdfIn PDF document text
    • https://rurevudo.weebly.com/uploads/1/3/4/2/134265418/5585190.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/fuwuzobewa_fanapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_5f9940fb7a8f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/jubijapotuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8eaba8-1f36-4a48-8d20-c48155ab2084/40446015192.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/rirakabiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3b136e-d920-4df6-9a51-c6fbd0c69c32/generator_excitation_system.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_off0000c1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F3 5272 bytes
SHA-256: a22ab315cd1f9afb5fefdc2b5249753a9decf314f7a24235075bf3f646a5840c
font_01_sfnt_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 10432 bytes
SHA-256: 9bafa617cacae8e3af95c84ca87979e7173f38e5c651f4f3c9fe41b485e39604

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