Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ed57ba2780e1a5…

MALICIOUS

PDF

45.8 KB Created: 2020-11-06 14:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 6f7fca06ccd417bd39db61a4bc9db02d SHA-1: fec529522f9941e0b62a4f9ba1e83e719fc59932 SHA-256: 85ed57ba2780e1a5c30cf0afc9730255758f14f9f59ce3cdaf04feb4bd4b059c
214 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://traffking.ru/123?keyword=scientific+notation+for+negative+numbers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5f8cef451ac75.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/zavilu_kalajotokoreb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5fa2cb6e481c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f8f6408ee128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_5f9e823fb651a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_5f9a71c569fec.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/6237118.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/391bc629-8551-43ef-a731-1e393eaa0fa5/43476203041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ce16962-88bb-41f5-8fec-0c2f2226b7a7/44629973426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84094e7d-ca4b-413b-acbf-31eaedfafe1c/48479192471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8ad47a-aebc-4fbd-88ec-754409cbb95e/xenunizewomovadivager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24bfae6-be60-4131-adff-4882e4599ae6/36752819623.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000668c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x668C 5356 bytes
SHA-256: cd2f838972a77bc9ba8488855a01c0201addd1f6cb5c5efa6ec3eb750304de46
font_01_sfnt_off000078a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78A8 10428 bytes
SHA-256: c6bc390e81f6613c0e8a622a695720dedec401d8ce0469dda7a231c857d9845e
font_02_sfnt_off00009c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C65 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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