Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f55220be537f5e…

MALICIOUS

PDF

34.6 KB Created: 2020-06-19 12:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11b015a94ddad6ca0bba14636efae47e SHA-1: f39197c7deaa3d18db7159b9e183bb0b81fa4bd2 SHA-256: 36f55220be537f5ef59fd9eb8c648b85de5e027527a325db1a54d1429b985904
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to PDF files hosted on unrelated domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to a technical manual and includes multiple URLs that are likely intended to lead the user to malicious content. The ML classifier 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 http://webdisk.catherinebobbymake-up-artist.co.uk/uploads/1/3/2/6/132695190/132695190.html#hach+dr+2000+spectrophotometer+procedures+manual
    • http://therelaxingstation.com/uploads/1/3/1/4/131438541/6723270.pdf
    • http://yourrestaurantbypyrweb.info/uploads/1/3/0/7/130738819/d25b66.pdf
    • http://anz.next-nutanix.com/uploads/1/3/0/9/130969830/xotifumeni-mabidimaxa.pdf
    • http://caneriverinvestments.com/uploads/1/3/0/3/130379426/09faaee2b2d8f2.pdf
    • http://birdstation.net/uploads/1/3/1/1/131164481/5313023.pdf
    • http://lanierbotanicals.com/uploads/1/3/0/6/130604632/fakomisi.pdf
    • http://mail.chardontomorrow.org/uploads/1/3/0/9/130969238/verakalogu_bixesuvu_runen.pdf
    • http://arvillefinacom.net/uploads/1/3/0/3/130324137/viwugoguvukewek-sigevomodotozi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b38.bin
46ff5b04925791df838c7925be282f7f4807db51806fc43a54c9050924081386		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B38 5380 bytes
font_01_sfnt_off00005d51.bin
16c23cdbb829052527ee5665bcf98375daa07eaebac82439a107877bce014c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D51 9660 bytes

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