Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5df40ff52a1bc7b…

MALICIOUS

PDF

43.1 KB Created: 2020-11-02 06:56:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 72f8fe2587d6086f9c6f8b79c584ae8b SHA-1: be91e5515634057fc626c6d3f7577a37db4451c3 SHA-256: f5df40ff52a1bc7bf8f00ddc8650a11bde0ecbb6bd77bebfe417b997a8d4ad41
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/aws?keyword=prayer+to+st+dorothy In PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/de4161d63c65f7.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/1/0437/2919/1066/files/86292409448.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/pursue_hillsong_chords_key_of_d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/631a7079-e05e-4b76-b3af-0a0dfda97b89/vasojegegezuwekaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70d4154f-6af4-41e6-bfa9-a6df554df16e/zowuberajafadojesumel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dda3377-1635-4731-9498-b215f5435ea1/difavatevupoleganonigob.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/aids_biology_project.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59990840-fddc-481e-96db-ec2dc21539e0/89309166122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbb46b96-d4fe-434d-9321-ebde63061f5d/sony_cdx_gt565up_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/funibikepuzidomizuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/i_love_it_when_a_plan_comes_together_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/blue_prism_training.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_off00005f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F30 4620 bytes
SHA-256: 234b950f7c4bb72254925577c1c1938745f02649f35fd7ee01f0573ace9fef2e
font_01_sfnt_off00006eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EED 10228 bytes
SHA-256: 643907616a1b35efb02687647f58e817387c0921ef28cc71eb11343653e8bda7
font_02_sfnt_off00009201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9201 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333