Malicious PDF — malware analysis report

Static analysis result for SHA-256 09dfa071e925698c…

MALICIOUS

PDF

72.1 KB Created: 2021-03-21 10:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c585bb7dd032e819609d8476cb93fbe1 SHA-1: d3327d5e9699f87ab1decceca0284eb9bb1875f3 SHA-256: 09dfa071e925698cb78f212f60152b510f31348f25ba0aeba1b050eb2cc2cc42
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing lure, employing a link farm and SEO redirector to distribute further malicious content. The embedded URLs, such as https://mezovuduw.ru/wix?keyword=ccnp+portable+command+guide+pdf, are designed to appear as legitimate guides but lead to a network of other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://mezovuduw.ru/wix?keyword=ccnp+portable+command+guide+pdf PDF link annotation
    • https://xapodopuk.weebly.com/uploads/1/3/1/8/131856257/divanoxud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_605599e300325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412896/normal_5ff7642e1cb0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461780/normal_60235a2c00e29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404287/normal_5fdda0dd21f95.pdfIn PDF document text
    • https://vabisoxapulaji.weebly.com/uploads/1/3/4/4/134444495/zutuk_jarodalor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368999/normal_5fe4925ca4137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479679/normal_6014d75e55b7e.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/873b33d5-38cf-47ab-b33f-92f946b69644/ikea_malm_bed_assembly_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/what_colour_is_an_object_that_does_not_reflect_any_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51352f3-ee4d-4b78-b27e-70bf8d3fd8e4/the_boy_in_the_striped_pyjamas_novel_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e78e6db-9c79-4fa8-83b1-bdb58b08a795/xarumeredaravemikama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ecdcc6b-d495-49be-8e18-2f58911c43e0/healthy_indian_vegetarian_food_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/11058805748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d5a290e-d140-4916-9a6c-a164512ce118/89742886769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f98574b-e2c1-430b-9383-8e5004a6d9cc/how_to_use_magic_bullet_mini_blender.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4050e3-a0bb-44ef-99fc-906f422bda81/how_to_make_an_advent_calendar_for_toddlers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464c7bdd-a0f3-4fe6-8168-846e348d0f5e/642512600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a110cb33-1ba5-4bec-8715-e81419c6aa9b/xuzafaguburetejoxemutujut.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_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 5340 bytes
SHA-256: 4e52f656017eac4b433e1ccb961e910f8754cb933c7dd72e7ed53e9395238822
font_01_sfnt_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 11828 bytes
SHA-256: 06f79498339891c07ce5b3eb81623a8c2239a1c02cde741479be1ded733a5ec7