Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6c7aa66f8cf361…

MALICIOUS

PDF

46.0 KB Created: 2020-10-09 09:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3342f45a383976440c21950277c2289b SHA-1: e1917df031ccb62161003f9cb02388ad23fd4fa2 SHA-256: 5c6c7aa66f8cf361dddf74ca36f73a008c049d5ff91271be543d95c27d5953ba
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/strik?keyword=addition+of+integers+word+problems+worksheet In PDF document text
    • http://mebumo.collinecornwell.com/uploads/1/3/2/6/132681887/vizexogadodufet.pdfIn PDF document text
    • http://files.thedetoxartist.com/uploads/1/3/1/4/131406456/wewujulede_vizeg_bodiledujazi_nejunivazexubo.pdfIn PDF document text
    • http://files.amberdietz.com/uploads/1/3/1/0/131069777/807086.pdfIn PDF document text
    • http://gigumigul.dolsenkinders.com/uploads/1/3/0/8/130815137/858028.pdfIn PDF document text
    • http://files.eviehatch.co.uk/uploads/1/3/0/7/130775511/fonokeb_nelamuxugekeg.pdfIn PDF document text
    • https://site-1043653.mozfiles.com/files/1043653/fezosak.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/2b9c6a12-ea6f-454c-85dd-700fcb995fa2/kubesiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ebd2e0-4261-4125-b2f5-344d79cdd29a/jejavureme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde4680c-13f5-41bb-b879-ca02712d4c8f/zozawonafifigin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9948e438-2809-43d9-8ec7-3dadd708f093/34863903462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee6ac4a1-85c9-48a6-abbc-ca08f960bb6e/daxufolonilunuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05d3ab3e-7a5f-4c66-b1e6-d185ebf7fc3e/22020493617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27ee80f-3e59-43b9-9449-e5c88be0b799/16627613042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7f8178-24e0-4efd-b41a-44eb8a55f97a/xivatawirabuzumepusafudex.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_off000073aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73AA 5532 bytes
SHA-256: 2ec2aa5944522c3df26c14bec4d1d3dce1e3f19c1fe1b291883cb83c037d5644
font_01_sfnt_off0000865f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x865F 10712 bytes
SHA-256: 7c4d5773366e98498f61ca758dba48f6288f04d74e3283a12a717c011f7c9e07

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