Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8b131615270b06…

MALICIOUS

PDF

32.4 KB Created: 2020-11-06 18:35:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f2c6abf9658116dc4dca1836366d7189 SHA-1: 5afa0791e9ff286ec8ea4f0e81a2573ca1907b71 SHA-256: be8b131615270b0671cdb2c6bbc46a1d0c0afbdb852bd02ea057679be5b87a7a
76 Risk Score

Malware Insights

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

The PDF contains an embedded URL that functions as an SEO redirector, leading to a phishing page. The document body text, though heavily obfuscated, includes keywords related to a specific company, suggesting a targeted phishing attempt. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafffi.ru/aws?keyword=prism+electric+inc+tulsa PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kovilowab/86033802389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e7bb932-326c-4841-9b7c-52c6885c1475/1800415062.pdfIn PDF document text
    • https://nevosaxovib.files.wordpress.com/2020/11/fizimobaruweboratiweti.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/duck_life_3_cool_math_games_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/819efab2-74cf-43b2-93cd-9b8546bedb31/nonemigilanix.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/8625666511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fedd95dd-1c97-43b3-8731-f64264576993/34103155459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2e5184-01d0-4fc1-8491-c78d213c354f/wakabitituxenum.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/catalogo_jequiti_2019.pdfIn PDF document text
    • https://fizafadolozu.files.wordpress.com/2020/11/31713389540.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_off000042a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42A6 4948 bytes
SHA-256: d7f6ebf9197a52574854e91bb4b69cfbb5981309331a606e12be48bcaf331bac
font_01_sfnt_off0000535e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x535E 9912 bytes
SHA-256: 162330d4751661a329617975bfe17cb2c4c290831fda3ca68787b11155ba0c65