Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e5093ffd99d783…

MALICIOUS

PDF

73.5 KB Created: 2021-06-09 17:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 939fc29bfd1d7e46309c3002ce6b35a5 SHA-1: 7b03ca52d3658c1be7bcbc7f5a92c85b9a38c011 SHA-256: 35e5093ffd99d7833f596c2954b40f94b329a12e77ec8186b095c4bcb8e371b2
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO spamming operation. The document body, though heavily obfuscated, contains a URL that appears to be related to song lyrics, likely used as a lure. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://wastran.ru/pbw?utm_term=tumhe+kitna+chahne+lyrics PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444882/normal_5fe28426369ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_604e480f8cead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_603bd01f1bea5.pdfIn PDF document text
    • https://jinepitabo.weebly.com/uploads/1/3/7/5/137515198/03d9707d82e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492536/normal_604766e46516f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500877/normal_600e26a57c1e7.pdfIn PDF document text
    • https://basazujuw.weebly.com/uploads/1/3/5/3/135301233/bufasamizudov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_60414d2e8fdd9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4412413/normal_60b2e7ade7f02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475992/normal_5fdb899faf7c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404133/normal_5fd796c958329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423732/normal_60b858af6e8be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_602639272185e.pdfIn PDF document text
    • https://peniluvemafoni.weebly.com/uploads/1/3/4/7/134705148/3429973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426682/normal_5ff00618daea7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/5160aa5f-3ca3-4a97-abbf-654e18e84f46/fivukidur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8893db69-3d23-4125-8b88-905eecee30d9/colegio_de_enfermeria_de_puerto_rico_vacunacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa3bdd9a-b75a-4b2a-b03c-742f43266486/libro_me_divierto_y_aprendo_1_editorial_montenegro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec486720-bc01-4e47-b165-3d4fd445ca0c/raw_vegan_recipes_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e981b00c-906b-46cd-9bef-605f621da807/lunuwitarekodekaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 5152 bytes
SHA-256: 7216a89c8502cb746780ea1c0fbb69c7c448dd9a730c23e683529170637416d5
font_01_sfnt_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 10684 bytes
SHA-256: e2c9ac652c7b8bf4be2ad283e77ad275808622e0970fb0c95e59396ae94ef12a
font_02_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 3100 bytes
SHA-256: c599d1e25ba687c2d550e4e87f217e3161d56cfad8eb15a41618f5c45b3ccc63

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