Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cd2989e52b3971…

MALICIOUS

PDF

48.2 KB Created: 2020-11-07 20:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fcd87ff8b45bc565e4dbb788d934015f SHA-1: 59bac04a75115f302b61efcc9efe35f9aece31f7 SHA-256: 90cd2989e52b39712b4668e6bc41eaa1c5a50819b298c0cd913ac1b582b9c8c8
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF document uses a cloud document lure, impersonating services like SharePoint to trick users into clicking malicious links. One such link, 'https://trafffe.ru/123?keyword=share+it+app+install+laptop', is embedded within the document body and also flagged by heuristics. The presence of numerous external PDF links suggests a link farm or a mechanism to distribute further malicious content, potentially leading to credential phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/6110408.pdf.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://trafffe.ru/123?keyword=share+it+app+install+laptop PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379032/normal_5fa5fa0a31563.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/6110408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5f918927350f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f876ef5a8fa5.pdfIn PDF document text
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/mixumimuni.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/mukobuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_5f94e9f743018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379974/normal_5f8b04114b0ad.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/bd6fa0e5-b698-4bce-862e-2950cfba5a85/five_feet_apart_netflix_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/80952946680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67524b82-7ff5-4b4c-a51e-73db29ec3494/wudofapuvexajoduzonafem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7074b3c-4bf6-4449-9568-87a01daf7977/futevidowonakapitugad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6333c3c7-d975-4329-8c98-5f7790581881/49820315032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e65da1-04c4-459d-b3f5-679c17681116/laxizedugifuwisebel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8b5889-c63c-416d-8378-589af3a49096/fukusose.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_off0000790c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x790C 5012 bytes
SHA-256: 4402658e2b46ce3d571d02d7ba025ce0847e64d1b4a39756fff4fad84feb73fc
font_01_sfnt_off00008a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0C 13024 bytes
SHA-256: c10c5f271632bdec374f04be45cddc8491ecb514a408f8ffb27d5ccf809f609d

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