Malicious PDF — malware analysis report

Static analysis result for SHA-256 581276d84c287be6…

MALICIOUS

PDF

45.4 KB Created: 2020-11-05 23:30:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: d7ff95ccca3e9ba58eefab7e41c5ec57 SHA-1: 26692d6c472038f237104efce8c4675415b37756 SHA-256: 581276d84c287be683d0f130e90278a587b2d8b1481179b497b4f081509276a6
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://trafffe.ru/aws?keyword=poulan+pro+weed+eater+manuals+download PDF link annotation
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/2270a771ab8a7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5f94c15be0d5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_5f90b6b6ac60d.pdfIn PDF document text
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/jibuxawuluj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403129/normal_5f9caaa9c723f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/swtor_update_6.0_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/the_call_of_the_wild_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/4e_monk_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/how_to_be_a_good_human_resource_manager.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/63046027972.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/kojixadedixomadesupe.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/tommy_bahama_cooler_chair.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/solving_simultaneous_equations_graphically_worksheet.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_off00007011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7011 5200 bytes
SHA-256: 26a5678e9ffd2aa0f855a584595dc8fe7bd676b0614fabfaef1500ed37b8bc74
font_01_sfnt_off000081ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81BA 11796 bytes
SHA-256: 77e02e62fdcbc0bee10d0538c594fa0caca5e9b82e579d0a0bba865c9687616c