Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cde2395da7e4e5…

MALICIOUS

PDF

72.5 KB Created: 2021-01-30 18:51:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b7743f6312c55b7404b090412a765d13 SHA-1: 16eeeefd8c5aa624510e353763e8e7989bf6fa8b SHA-256: 34cde2395da7e4e56b81df6b21ff4c83e9c7d43bd02675b35cbbc938bd37acd7
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm or SEO manipulation scheme. The embedded URLs, such as 'https://baarspo.ru/123?utm_term=reflexiones+de+alcoholicos+anonimos+en+audio', are likely used to redirect users to malicious or spam content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://baarspo.ru/123?utm_term=reflexiones+de+alcoholicos+anonimos+en+audio PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5ff5eb0736de5.pdfIn PDF document text
    • http://ca-manalapan.space/idle_gun_tycoon_download345c1.pdfIn PDF document text
    • https://bazopozetera.weebly.com/uploads/1/3/1/6/131637116/7758981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402244/normal_6004bcfedbbd5.pdfIn PDF document text
    • http://makamar.tech/portal_usuarios_eps_sanitasy6b2u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487906/normal_5fff1b6fcd296.pdfIn PDF document text
    • http://hopecommunitynaz.com/apod._nasa._gov_scale_of_the_universejv58c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/satudifin/xanet.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/chatrapathi_movie_ringtones.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/niwugigevolilopomamovik.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/fokal.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/11785630455.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/creo_parametric_2._0_free_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/medinijuxodepusiguku.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/altaf_raja_song_song.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/9449083764.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/sozaxediromamosibolisexe.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_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 5240 bytes
SHA-256: 6b7707f6c6161bf4a55816518cc7589bc13ae28862cfc0b2177d9d057ffb51e5
font_01_sfnt_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 11832 bytes
SHA-256: a4a6e432ef916b328f31280938e7946dbac5ea33794de167cfd3863fcf2388c2

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