Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05f397dbb069268…

MALICIOUS

PDF

42.2 KB Created: 2020-11-08 20:39:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 85b2649e597d9ab2cbd077aa0b2a1769 SHA-1: 2293b95f079b7a6d022673f9e67229f198f9d9ff SHA-256: d05f397dbb0692688f85608d9d2486b1caceb4910fa79dc9890fa4472e5b72cc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file contains a large number of external links, identified as a link farm. The primary malicious URL is 'https://trafftec.ru/123?keyword=desktop+goose+free+version', which is likely used to distribute further content or redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the link farm and potential distribution of malware.

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://trafftec.ru/123?keyword=desktop+goose+free+version PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rezekine.files.wordpress.com/2020/11/tatojesanawav.pdfIn PDF document text
    • https://forakufu.files.wordpress.com/2020/11/wurovorobo.pdfIn PDF document text
    • https://fepefik.files.wordpress.com/2020/11/37369046595.pdfIn PDF document text
    • https://kudavibagixe.files.wordpress.com/2020/11/template_cv_simple_indonesia.pdfIn PDF document text
    • https://namufez.files.wordpress.com/2020/11/74925906713.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/98720254736.pdfIn PDF document text
    • https://xewuripew660320655.files.wordpress.com/2020/11/74859251399.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/xitafoduxuguvixabitujuj.pdfIn PDF document text
    • https://galitedavaku.files.wordpress.com/2020/11/41531066890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b2ee404-0a2b-4089-8d0d-40188fb76e61/lipifibesewavinigof.pdfIn PDF document text
    • https://toxemoz.files.wordpress.com/2020/11/mastose_mammaire_et_stress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9299710-1326-446a-80ab-7ef2b2b00c86/xudute.pdfIn PDF document text
    • https://vevarog.files.wordpress.com/2020/11/duwiwimigag.pdfIn PDF document text
    • https://jonitolatej.files.wordpress.com/2020/11/82619815531.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_off00006376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6376 4948 bytes
SHA-256: 531781564ad0ffa561ae535bccc2cc96da60307cf9f55157afa5136503ccdd90
font_01_sfnt_off0000747c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x747C 12136 bytes
SHA-256: 89d399057fd455118895cca6d6b5d17d62e78eccb186375a3444e1ec3660bd5a

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