Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ec90c1c41410bb…

MALICIOUS

PDF

42.7 KB Created: 2020-09-30 09:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 2b8e6a46f0d9cfa461fc09a5cf8eb085 SHA-1: 4c367b8e3a0b3d064e90fc1eab5602158faa4192 SHA-256: 37ec90c1c41410bb6b776bf80ebfb372881d9c3bb649c8ae066a4e2a419add72
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://cctraff.ru/strik?keyword=dictionary+of+science+and+technology+pdf In PDF document text
    • http://relud.myshinglesstory.com/uploads/1/3/1/6/131637016/mefusaribovinorefak.pdfIn PDF document text
    • http://files.nancebmecleaning.com/uploads/1/3/1/4/131453907/9830008.pdfIn PDF document text
    • http://files.brokenrailranch.com/uploads/1/3/0/9/130968917/jadipoxejariwediwa.pdfIn PDF document text
    • http://files.harvestministriesfl.org/uploads/1/3/2/8/132814276/xufujuliseraj.pdfIn PDF document text
    • http://files.ashlandcountydemocrats.com/uploads/1/3/2/7/132710661/pokodukoluzam.pdfIn PDF document text
    • http://bufipusib.beadvillechaska.com/uploads/1/3/1/1/131164067/9537267.pdfIn PDF document text
    • http://files.filipaguimaraes.net/uploads/1/3/2/7/132740619/votupunas.pdfIn PDF document text
    • http://nulez.onceuponatimeinva.com/uploads/1/3/1/3/131398430/868c96d6b0.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/32c61815-9370-491f-a1f3-cfbd8ba5442e/53452679245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be270dbd-a161-4174-9d3d-de96c35743cc/61886697266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dcdae56-18c8-4c8a-afea-a152039eb50e/zofobigejowijufozamido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/553ffa4c-2fff-443c-b707-bbf81620ef70/nefazabenumajezapirefovor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5015/9265/files/wepapuwetomifapajoxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/72872009297.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0601/7186/files/42451643514.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/8090/2806/files/poxilitomewumunum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4752/9877/files/crime_and_punishment_quotes_about_isolation.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_off00006842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6842 5516 bytes
SHA-256: 2849b889a92c188c0ccc3031895adcb8dc6e8ea33636850c1740d4ec55db8fe5
font_01_sfnt_off00007b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B18 10040 bytes
SHA-256: e6167854f71529522ba625fffce7ba5c3f27fd2505b7f2fd13cb802c8e92c6dd

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