Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea8898f178ce5c8…

MALICIOUS

PDF

50.7 KB Created: 2020-11-06 22:11:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3e056c1862fb3bfaacdaff9629d3e486 SHA-1: d7ecb8d8aacee36bec285d2029544b8fe46c110f SHA-256: aea8898f178ce5c860bc72a6dc7b3d8bf30ed5da5b7f2492ac01593c98f93056
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/123?keyword=acidos+nucleicos+ejemplos PDF link annotation
    • https://jigupipugefelo.weebly.com/uploads/1/3/4/3/134387822/mezerobusifof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419441/normal_5f9fc49bcf895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f872e805e080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_5f9fc7a0ab073.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/abee60c4ffd.pdfIn PDF document text
    • https://jolefopasovoja.weebly.com/uploads/1/3/4/4/134402584/pojonatovasejotukes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5fa01a79eb688.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/739a918c-4502-42da-8338-17a65fab60bc/78703724203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2df869e-2f66-4ccd-b77c-c66cd1bf46a7/puwumavamozebuf.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.pdfIn PDF document text
    • https://rasofopob.files.wordpress.com/2020/11/73553922448.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/faruwadora.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_off000084de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84DE 4976 bytes
SHA-256: 89d9b38c6106286421d2035ca2b7f7cfa1fb0f8c7aed3d1ea65ffd875ea1f481
font_01_sfnt_off000095c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95C0 12148 bytes
SHA-256: 988371effc9eb3e763fcdab338ce35070853d3905f6705175a9da4d77effd7b5

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