Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb35c8a65410535…

MALICIOUS

PDF

55.0 KB Created: 2020-10-11 06:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1aef449fe8ce1553b5b65cc0c4d86278 SHA-1: 0a1dcc7ebb841c3c2d1be1922db9d15c6c5e2511 SHA-256: 3eb35c8a65410535b5a5b1a49fb4466d34afd93742aeb1670469de4d2f2e2dd8
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=install+cydia+without+jailbreak+ios In PDF document text
    • https://site-1037905.mozfiles.com/files/1037905/nuwuwurefovujerajukud.pdfIn PDF document text
    • https://site-1036956.mozfiles.com/files/1036956/labijevowesewexodojak.pdfIn PDF document text
    • https://site-1038737.mozfiles.com/files/1038737/xutovosoxojotofemiri.pdfIn PDF document text
    • https://site-1039197.mozfiles.com/files/1039197/6435628323.pdfIn PDF document text
    • https://site-1037899.mozfiles.com/files/1037899/32913087216.pdfIn PDF document text
    • http://zogegatub.lezgetbaked.com/uploads/1/3/1/1/131163772/8174827.pdfIn PDF document text
    • http://files.taketheleapcollegeessays.com/uploads/1/3/1/8/131857920/ramige.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8591/2477/files/dedowometivozoni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/9783/7734/files/diet_history_questionnaire_ii.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2002/7557/files/starbucks_going_global_fast_case_study_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5725/3018/files/ballads_poems_for_kids.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4247/9007/files/types_of_pipeline_in_computer_architecture_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64014793-280a-4c16-9b73-648d66c4e31b/91983382466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5c50dd-b032-4594-aa45-032ba3faea28/35221982601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24e062b4-b920-4759-9e72-25947464d406/kadaxolegegozaxopomu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A23 5320 bytes
SHA-256: 03679aea6f3c8ebc1eb7fb4f380faf5fc1265aa1ccf9f7e857fbf6b6be9ee0a4
font_01_sfnt_off00009c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C2E 10660 bytes
SHA-256: 84235c7bcb9af1131cce3215bfad005b00f0fab090274d19eb47e0fc7b53818a
font_02_sfnt_off0000c06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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