Malicious PDF — malware analysis report

Static analysis result for SHA-256 85996d112d765a2c…

MALICIOUS

PDF

44.3 KB Created: 2020-11-08 02:34:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 95590f014cd893a365680806820abaa0 SHA-1: 3d5e40c5e956c8d9b99034307f7fd1aa7d0e7fdb SHA-256: 85996d112d765a2c6f3cb8d8a33668674d8efe23794ffc860ab369fa3bc9f59f
156 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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://trafftec.ru/aws?keyword=rdv+ice+skating PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380871/normal_5f8cf85c4737f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_5f9d5d2b2ed18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394073/normal_5f96c63c89b69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_5f9de94f510cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5f910ee68e485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f874a4ec75a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_5f9457d2ac7fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f9eed481ca98.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/7df3c1b2-a029-4242-825f-4d02be00ce28/78036704306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9725de71-f497-4dc7-bd34-60775e7f466a/21476535529.pdfIn PDF document text
    • https://vivader.files.wordpress.com/2020/11/dark_souls_boss_health_bar_meme.pdfIn PDF document text
    • https://nifonuso.files.wordpress.com/2020/11/xerikegulibefomumov.pdfIn PDF document text
    • https://silisejez.files.wordpress.com/2020/11/68446682015.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/bifogeluvitulokoteb.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_off00006c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1A 5108 bytes
SHA-256: f313f63644ca7c84df710719b703b340c3056d7eabf9abc8f8b43283f15cdbed
font_01_sfnt_off00007da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA8 11584 bytes
SHA-256: 40931525ca31d56973db166985022e3ab65cb81e526189002d88d7babec6b47f