Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a7d0b4d90750d4…

MALICIOUS

PDF

72.5 KB Created: 2020-12-21 03:36:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cd862a960bce1e2fc02e8aaeea5b7f0f SHA-1: b8639f39f51f780fe2cb2e66d195e1f285777025 SHA-256: 37a7d0b4d90750d4eb9d9c6a56279bebc7bc3c50895a66f5ba152c749e08b35d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. The primary external URL observed is 'https://trafffi.ru/123?utm_term=hamlet+act+2+scene+1+summary+thoughtco', suggesting a potential phishing or traffic-generation scheme. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=hamlet+act+2+scene+1+summary+thoughtco PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450248/normal_5fa4b4d047945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419206/normal_5fcdc60600aa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459464/normal_5fa5b27308078.pdfIn PDF document text
    • https://nedudefo.weebly.com/uploads/1/3/4/3/134389218/9730104.pdfIn PDF document text
    • https://jazexupojofon.weebly.com/uploads/1/3/1/4/131409098/384e651065815d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_5f889e52c4752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470699/normal_5fdc246fa7a14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_5f9890cb81b73.pdfIn PDF document text
    • https://lonuxomefuju.weebly.com/uploads/1/3/4/8/134871759/gupuwemikuzovov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f8bfcaf22184.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc54a5dc30a162e0c6f8caa/t/5fcb18e0b6b7366152f32186/1607145698493/ludo_game_board_printable.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce43840db0542b884efe37/t/5fd061d0a91a8d243379b01f/1607492050078/london_underground_subway_simulator.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64de3116eb00e3c70d0bb/t/5fd0b1e789fd2c07d108f94d/1607512551722/city_of_warner_robins_tax_assessor.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 5460 bytes
SHA-256: 1ae2afe3fd8867a93425048da41cbdc92cd7f1784b23ec0ad07f56e35538f78e
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 10516 bytes
SHA-256: 19caa211d02c396a1f7b72368bad34c4f6e42ad8729e1e7266cb86f06d2b6ef4

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