Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c81ec96ff358c0e…

MALICIOUS

PDF

36.4 KB Created: 2020-11-05 22:55:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: c662cd81e2793463a2cc23abd444c415 SHA-1: b83bb8b1168b25086388881fb3aa6c9b016f0fb1 SHA-256: 6c81ec96ff358c0e9216dc6e094a5e2682427c91ee429c0bf4fad8551a681c12
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://trafffi.ru/123?keyword=boxhead+zombie+wars+unblocked+77 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416798/normal_5f9dc5607f1f7.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/xaxopobavami.pdfIn PDF document text
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/lesuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450338/normal_5fa2f69cbff89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f8a0835c962d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15c9396-09b1-4b9a-aa46-ca0f7d72e680/dazemejefabebov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3382836-fc8e-4dc9-99b6-f76699687591/79519571482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6867b84c-a99b-41c1-8ffd-931bc9051fc6/adverbs_of_time_in_french.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb0e401-d7dc-46b2-adc4-dd012b26b2a7/40883463624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2f3224-a374-4c7d-b674-3781029528d1/88967031647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b66da97-87c9-4bb6-b457-c952450c1431/sevdim_seni_matematik_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/876b605f-4bf8-4339-bd2b-72c9523e4c5f/austroflamm_integra_pellet_stove_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ebbc78-b437-4a7e-b79f-066ffb3fe5b6/wewukajefozojeridazosiko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0430/3784/files/age_of_consent_in_new_york_2001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f78d554-1ab9-4b55-afbe-a3c35d7a5999/kopozefuxosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3649/3992/files/71916062955.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_off00004d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D9F 5724 bytes
SHA-256: e6eaac99a2d4f680eb3d5575b190761a0adfd629a2c25b7835ad129a931e503b
font_01_sfnt_off0000610f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x610F 10488 bytes
SHA-256: 9a0f936ff09d8fad045856657f0e3005458db56d1f8546a9d73438a28d248ac9

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