Malicious PDF — malware analysis report

Static analysis result for SHA-256 da09ff915de7b79a…

MALICIOUS

PDF

77.0 KB Created: 2021-02-23 03:57:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a540ab33c10467f0996d13b81dc1929e SHA-1: a1cad021f8379eb41e129fd2404baa8a476081b2 SHA-256: da09ff915de7b79a498c2a8f8bff8d5a537a04f627dde034ca519bdaafd5a875
96 Risk Score

Malware Insights

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

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 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://crophysi.ru/aws?utm_term=why+is+my+hp+printer+not+printing+double+sided PDF link annotation
    • https://fuwurukuzubefek.weebly.com/uploads/1/3/0/9/130969433/7655807.pdfIn PDF document text
    • https://julogunakununu.weebly.com/uploads/1/3/2/8/132814048/1279599.pdfIn PDF document text
    • http://kivumokaf.22web.org/59946826847.pdfIn PDF document text
    • http://precabinets.xyz/zevesezazfai0h.pdfIn PDF document text
    • https://sepubipig.weebly.com/uploads/1/3/4/4/134445985/d6101895d.pdfIn PDF document text
    • http://kurs1.xyz/77151838232f5uz.pdfIn PDF document text
    • https://titerafutar.weebly.com/uploads/1/3/0/7/130775646/1888568.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jolozidabi/os_x_catalina_slow.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/aws_cli_s3_files.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/business_letter_template_spacing.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/vozudurikufubepeli.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/fujavemigat.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/pacchetto_aggiornamenti_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/bibliography_apa_format_multiple_authors.pdfIn PDF document text
    • http://javozajesaretu.epizy.com/toleb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 5300 bytes
SHA-256: b8a431a5d7d2c70898377b6f91a9fc19b2cb2ecab960c0d537302c90169d24a5
font_01_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 11076 bytes
SHA-256: 74d011a75280aece1554b2a38ef695596f3683772c6bc65acfc82494be092c62
font_02_sfnt_off0001185d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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