Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1c74a36f1ad233…

MALICIOUS

PDF

41.3 KB Created: 2020-11-06 14:18:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 004e795f333c55585c2efd1cfac4928a SHA-1: b99fb0e43628e733a143eac0586a4a8b7329e3be SHA-256: 7a1c74a36f1ad233ed0dbe91c70d43a2b901630a7dd09ad54c9b5d9db2b3bd45
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links pointing to external websites, a common tactic for link farms or phishing lures. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect the user to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings point to a malicious PDF designed to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffine.ru/123?keyword=knitted+winter+shawl+wrap+around+pattern+free PDF link annotation
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/b726ec796bb5.pdfIn PDF document text
    • https://jowamevo.weebly.com/uploads/1/3/4/5/134511132/gakexamefikot-wosepimedebofa-digiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402478/normal_5f9a2c7a994c6.pdfIn PDF document text
    • https://momezinitakik.weebly.com/uploads/1/3/4/3/134322843/963611a23711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f8b4be4aaa69.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/logifiwakikabopef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450517/normal_5fa36db952c95.pdfIn PDF document text
    • https://pojosividadom.weebly.com/uploads/1/3/4/5/134524524/4653609.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/bitifarom.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fibaxizimudez.pdfIn PDF document text
    • https://sijaxidav.weebly.com/uploads/1/3/4/4/134499987/2110891.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/21f29b1d-47d5-45ee-931e-332d202118ca/9158769638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33256089-37b5-4fc2-ac5e-8b86c6466547/vozivabimidogudil.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_off000060d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D1 5188 bytes
SHA-256: ceb3df6adc86f0e9ca8bbc17ad361a95dd6b9675196c48940718bcf50d65e527
font_01_sfnt_off0000728a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x728A 11180 bytes
SHA-256: 10be054d551878e82f4a66f80c9d00b21601381c564c4a92896d3f5e883542d8

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