Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8f2d05b5e04968…

MALICIOUS

PDF

40.9 KB Created: 2020-11-07 14:09:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 5afaf3efa68feb39ab0b31f89337b213 SHA-1: e954243fa9cfa44fa8581f7541dcdc31f40fec32 SHA-256: 1a8f2d05b5e04968b444cbbc067f9ecd53ea290bb6cb4238874c53eed19b4082
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=nike+business+strategy+articles PDF link annotation
    • https://tuxupifogufo.weebly.com/uploads/1/3/4/5/134594750/e7c21914471d6.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/tusuze_xidexiwu_vovasuzelusas_kibop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f86f49aabd63.pdfIn PDF document text
    • https://roboxojepuz.weebly.com/uploads/1/3/4/2/134235986/f4487ea7cae.pdfIn PDF document text
    • https://zotexujefu.weebly.com/uploads/1/3/4/3/134322023/8588697.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/rorives/analytical_chemistry_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/synonym_for_writing_assignments.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/fusenolowajox.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/90553228391.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/blackboard_university_sc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ee556a1-4eb0-48cd-a966-d5955edfcb78/nordic_museum_seattle_store.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/descargar_manga_candy_candy.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/46128896768.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/what_does_ps_mean_in_a_formal_letter.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_off000060ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60AD 5240 bytes
SHA-256: 3ecbfa698f874bdbed72d4539fe66307239e5094d1e8453775532bae0469576f
font_01_sfnt_off000072a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72A0 10996 bytes
SHA-256: 8b4c1ae27583a7f36b01b7f1432403c8634d84ebba564b84a1b10341b35046dc