Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b1c0a916083705…

MALICIOUS

PDF

44.9 KB Created: 2020-11-09 04:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: aa380672053ffce9425c73506e06957d SHA-1: 99c1033c79594c80fc06689cf149974fc14bf8af SHA-256: c0b1c0a916083705da43ea1bcc20b23e0d092a60c1c3255728df2baf9a1422c6
136 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffset.ru/aws?keyword=the+lovely+bones+alice+sebold+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370768/normal_5f8c71c8a855a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_5f96ea251012a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_5f93d2dd01060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_5f9534710f714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f9c735c339a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dafupexun.files.wordpress.com/2020/11/nanogivexodudoroxirodowol.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.pdfIn PDF document text
    • https://tuvogeluwe.files.wordpress.com/2020/11/buddhist_philosophy_a_historical_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc2b3e4-58dd-494e-9812-7a1a323ec0b2/daligidekerixotomolit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690b2171-e773-4734-947f-e17663638544/bunker_hill_security_system_manual_62368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec71f07-58a6-45b9-8f49-ee19a8fec150/simple_past_reading_comprehension_test.pdfIn PDF document text
    • https://nenabileli.files.wordpress.com/2020/11/fisumafagiramox.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_off000070ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70ED 5396 bytes
SHA-256: e6043550265178e22fc5a3bc28b585380c81d979567d05db24a555d82b77f5de
font_01_sfnt_off0000834d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x834D 10380 bytes
SHA-256: 26437549f10b445e28cd8593a02d248a43389c095d77d258c21755ce784948f7