Malicious PDF — malware analysis report

Static analysis result for SHA-256 096091bd23449eda…

MALICIOUS

PDF

82.2 KB Created: 2020-12-17 18:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1a552dd07cceef19d510d21e19c0252b SHA-1: 796efa5a5b8db021a098bc4ad8ffaf5446668aee SHA-256: 096091bd23449eda1148775de69fd7bd8138994d56d956183f48a3bc2dff56f9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URLs, such as 'https://trafftec.ru/123?utm_term=dissolved+oxygen+and+aquatic+primary+productivity+lab+answers', are likely used to redirect users to malicious sites.

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://trafftec.ru/123?utm_term=dissolved+oxygen+and+aquatic+primary+productivity+lab+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f8bbfe9469eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_5fa5b8b7515ff.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/zukurumeni.pdfIn PDF document text
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/vinit.pdfIn PDF document text
    • https://vibitidit.weebly.com/uploads/1/3/4/7/134712982/5944123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_5f96c1e19f85a.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/5c0d372f-ba3c-4de9-a455-75714baab001/56552168226.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0696cdf132613bbbb46ad/t/5fd194ea5e090321caae2187/1607570669087/all_stars_cricket_2019_session_plans.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fceb2c4c2c1204b4fba4d42/t/5fd10f69f4e1da4bad70c09d/1607536490089/11892387376.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2e1c227a199023ac2594c/t/5fd059e7a91a8d24337899b7/1607490026861/perfect_ironing_app_store.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/88176864789.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce7adeb0d0046e84609e63/t/5fd6734effab5d3c56fcdf44/1607889743023/6065330014.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28fbed26ff1194f7e5808/t/5fc5bedff81c9a2a0c6aa1b5/1606794975348/human_anatomy_for_artists.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/sirexejaso.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_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 5980 bytes
SHA-256: 980f516faf1b95470443dd2a50884662075df897672331c6c32c9ba7800cea23
font_01_sfnt_off000114d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D3 11256 bytes
SHA-256: be4d289817550ff4964999ad10105c177f51a4e84ce754b6e94706d6fd9a639c

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