Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c13f297829978ee…

MALICIOUS

PDF

68.8 KB Created: 2020-11-30 13:13:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a4631338b1f7fcd944ecb8b2e2f18d1e SHA-1: bd8993e59b043255dc70ffa7ac401e73de49e37b SHA-256: 6c13f297829978eebbf31888c5447ca259611aa170e02380cb970b7bbd7e97b8
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/123?utm_term=curve+sketching+calculus+cheat+sheet PDF link annotation
    • https://nomukumimakolu.weebly.com/uploads/1/3/4/6/134649360/rumukuf_fisovapufoza_nitumegazazota_vavobugevejiwas.pdfIn PDF document text
    • https://jawuzinirofona.weebly.com/uploads/1/3/4/8/134886132/26195888dbc60ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5f88b9f281023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5f959356a68e7.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/476272.pdfIn PDF document text
    • https://veraroligesabo.weebly.com/uploads/1/3/4/3/134377370/vuzinow.pdfIn PDF document text
    • https://jazafojof.weebly.com/uploads/1/3/4/3/134310209/5299645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479254/normal_5fbac5631dce5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412415/normal_5fb50b22cacc9.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/wexukufedepim/wentworth_elementary_school_maine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e726a871-8b3d-4d4c-b31a-2e24d0e2b22c/jivijapirazudoxud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b9bccb-f56e-4fb9-8733-7a476a959b2e/24432456949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1653aab1-4c73-462a-a833-fa1e306267bd/jaboganumofefur.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/g2_vs_tl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd986c28-7231-40a2-bc2c-00bce570e511/lorunazozanofoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54c94993-d6a4-4b59-9dfb-ce84f722653a/26021539515.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_off0000d0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FE 5092 bytes
SHA-256: f8fb01ecd25e5f14bf347eadd7c708c3786f94485b4857e2f0fa575179211645
font_01_sfnt_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 10668 bytes
SHA-256: b85e47b1b8184ca5d5fcd4f304eeca6fcad7467ca06593d5e12c3c3cd80e8c41

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