Malicious PDF — malware analysis report

Static analysis result for SHA-256 078b295d7c3a5d85…

MALICIOUS

PDF

43.5 KB Created: 2020-10-04 17:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c771b48ffd1c37e455858dc072f11891 SHA-1: fd28f732fe9180bb488761556b9cef7589d3efcd SHA-256: 078b295d7c3a5d851c7e346383991ef7dd4e329fb5d44dcbd5a3778dc1cc9657
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?keyword=ejercicios+resueltos+costo+volumen+utilidad+punto+equilibrio In PDF document text
    • https://site-1036743.mozfiles.com/files/1036743/46550951118.pdfIn PDF document text
    • https://site-1038313.mozfiles.com/files/1038313/kizoligatukaralaga.pdfIn PDF document text
    • http://files.mandelnewman.com/uploads/1/3/2/8/132814544/9893439.pdfIn PDF document text
    • http://files.glfenterprisesstone.com/uploads/1/3/1/3/131379776/sererum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8510/6852/files/31397362817.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7006/2753/files/the_eleventh_plague_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3673/7177/files/how_to_make_a_dichotomous_key_for_leaves.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3000/5928/files/lavudojokifibugowol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd1ac0d-b084-4d42-a223-b0df2b04b085/roderer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79094d1d-cb1e-4ab9-b2e0-51cc463b09eb/36521154776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a440d02-8afa-46cc-8e1a-30f5832e428c/84164544869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad469120-6a7d-4211-849f-b638423a8d49/xopawiwased.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccd378d5-aff7-435a-b07d-d307afb391c0/jurosixogamogufepidogenap.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_off00006687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6687 5580 bytes
SHA-256: 83f56bafbb0198f8ac9455444952106173a68d9cfb19a0f6598f7e2f78d736bd
font_01_sfnt_off0000796d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x796D 11488 bytes
SHA-256: c895bf1092fe81cf8d71c321f853d059c01502d4a0724293fb4a41d58dca562a

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