Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89a1fbf17dcd240…

MALICIOUS

PDF

50.1 KB Created: 2020-09-30 14:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 12f2b95dc16cdd9a8d14dbe5ee2f835f SHA-1: e503de41de78655e034a4b1ea1ed921b6bab60fe SHA-256: a89a1fbf17dcd240f113de1547be3d496f761c79ca8c7499a612315d8c293173
202 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=sites+to+download+ebooks+pdf+free In PDF document text
    • http://nujuxofa.dhmtoday.com/uploads/1/3/1/4/131453197/525884.pdfIn PDF document text
    • http://nokumivo.pitzeradventures.com/uploads/1/3/2/3/132302978/2114012.pdfIn PDF document text
    • http://xadafiji.visitleecountyky.com/uploads/1/3/1/3/131398091/rumanipidawu.pdfIn PDF document text
    • http://dazakepi.sosdesignsvb.com/uploads/1/3/0/7/130738779/8888212a71e62.pdfIn PDF document text
    • http://pozuno.samschmitz.com/uploads/1/3/2/6/132681670/gigilog-xasakenaw.pdfIn PDF document text
    • http://files.scmccnj.org/uploads/1/3/0/8/130813429/lubelesizik-mixigos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/950bec73-7658-4f0a-bab3-0c9239763628/66495001550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ddf527-a1a6-4ad0-9568-978e1891e602/fezemopaxisakafexikut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a737e2c-cf01-4f83-a0b2-5aadcf1c3f15/zexebigutudamolaneburijof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59d940f-fa6c-4325-a1a5-9aa0bc23fc66/wajasegorawodabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3faf545-3190-4cd6-bd36-056e98f67f4e/lukeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee26b4b2-2914-4679-aa72-310015371bc7/veduladonirinetevafume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/838886b8-17e4-4ce5-b130-9579e5b95ac4/novomibiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91845b2e-c4db-4968-af76-fa7a0e1da24e/1022867654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b182cf5-8453-4f2a-b962-bc595b3a9df5/54438719093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a14d76-e9fe-4f41-bf87-1c671df12d46/rizelaxigevazoxefu.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000671c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x671C 5224 bytes
SHA-256: 293fb4524b552e3fa25d5b7a6496c77332a0a4156477f70ce77cea4fbd5e44f2
font_01_sfnt_off000078e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78E9 6068 bytes
SHA-256: cb159cc9d714520fdf604515834a8e5d6ccdf81551317d8133b939af7313f940
font_02_sfnt_off00008899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8899 10752 bytes
SHA-256: b225ad1f1fda0be80f6e2bae41a9207ed5cfbf263939857990da1f43a26ccbc4
font_03_sfnt_off0000acdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACDC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3