Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d155c8f4c3fe37…

MALICIOUS

PDF

54.3 KB Created: 2020-10-06 15:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 9fb686b0ebb69fb35317b6fb302f5d47 SHA-1: f090a58fb61955f17a3cb35a3d12453759abf265 SHA-256: 21d155c8f4c3fe37d2c9fb4f66bc4e5a44ca3b6fcad27eef0a3d039c780ba888
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://ggtraff.ru/pify?keyword=s14+auto+to+manual In PDF document text
    • http://nojebemi.stevenodonnell.com/uploads/1/3/0/7/130776485/jesagukarelozulanik.pdfIn PDF document text
    • http://files.collegiatelearningcenter.com/uploads/1/3/1/0/131070394/mubevejekebe.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/1/0488/3739/4597/files/zekoxeberekukepebide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2403/9592/files/a_mothers_hope.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8107/2789/files/45500647249.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5942/4665/files/walk_thru_the_bible_new_testament.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/vexutabanaliduko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/641033e0-f3a0-4b0b-9164-96fc601e2ef4/93902258209.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/warriors_coaching_staff_salary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2917/9811/files/causes_of_the_cold_war_essay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9103/6833/files/volunteer_job_description_summary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6187/8687/files/henrietta_lacks_rebecca_skloot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9479/3635/files/dd_campaign_writing_tools.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000975b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x975B 4800 bytes
SHA-256: ae8632c2ef20e045090bcbfc9be23422373bb10dfe68e0b8da34a846d16d3d12
font_01_sfnt_off0000a7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7A8 10792 bytes
SHA-256: 40efeb3ec614785a1713aa6c035004634bd671205b636052ce973aabf3772817

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