Malicious PDF — malware analysis report

Static analysis result for SHA-256 61eefea01581a5c1…

MALICIOUS

PDF

50.8 KB Created: 2020-11-07 16:24:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4d570bcaa683d23ccfdc393773fe9467 SHA-1: d1ab23701e42385897b63ccf79c8a15d50ad11ce SHA-256: 61eefea01581a5c1a0c4ef421ee9ed2720312826536d76fd345f15ccaf5cdfed
104 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 an ML classifier. It uses an invoice-themed lure. 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 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafffi.ru/123?keyword=direct+energy+door+to+door+scam PDF link annotation
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/resojubetufekunod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408582/normal_5f9cbc26be01f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_5f905ebbd4c47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f87168cd386d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388835/normal_5fa4399d46009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f9a42652d910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387242/normal_5f91648256d52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_5fa3bded8307f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375525/normal_5f98222a14b43.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://uploads.strikinglycdn.com/files/7fde0e0f-dbcf-4665-84ba-c5c384397b57/memento_full_movie_download_with_english_subtitles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b04210a1-7097-4622-bed1-f2e94c47b91e/13801876457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a980210-858e-491d-a939-aafec33076a7/7826256474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3768ad-1d17-4a3f-8104-526191db97d2/in_cold_blood_persons_unknown_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6368a6-12bf-4856-9595-45c891dfb636/ruziwetapovokabiperi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/732b3407-579c-4fad-9af3-120fc3bac551/55126679857.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6583 5116 bytes
SHA-256: de66b3db7b6c929ef3a45e48b9058a42b39d6670538bb4c76ee4bd955af10bbd
font_01_sfnt_off000076d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76D9 10488 bytes
SHA-256: cd52e74a198aa3fa8bc45b5142761754683593c3b14256be28896e787cd4715e
font_02_sfnt_off00009b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B16 16096 bytes
SHA-256: 3bb08857b08983a257d5a2052628e18542fd51c8d29f5bbef87ea8b8ace00841
font_03_sfnt_off0000afdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDF 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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