Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab55fbf6241b26f8…

MALICIOUS

PDF

29.9 KB Created: 2020-06-04 06:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cdbbdeb8e5e171a20685dedc9188894 SHA-1: a1da3e50b021b9dd9ad69d4bf5ccb5ad2c9148d4 SHA-256: ab55fbf6241b26f8f5cc6634098d5408d094417b01b73df255aebf4b98ad6f6d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file, disguised as an academic document, contains a significant number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown URLs suggest a content-luring or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://h543s.bpmtc.com/uploads/1/3/0/4/130478772/130478772.html#abnormal+psychology+7th+edition+susan+nolen
    • http://mail.signsbylynn.com/uploads/1/3/1/4/131410434/pufigudupato.pdf
    • http://mx.raskinstudio.com/uploads/1/3/0/9/130970012/c0649049c7cc2.pdf
    • http://allytheatrecompany.org/uploads/1/3/1/4/131454435/685085cb2f.pdf
    • http://lewisbaymarine.com/uploads/1/3/0/6/130604148/xudepolebomasek.pdf
    • http://h543s.bpmtc.com/uploads/1/3/0/4/130478772/terms.html
    • http://h543s.bpmtc.com/uploads/1/3/0/4/130478772/dmca.html
    • http://h543s.bpmtc.com/uploads/1/3/0/4/130478772/policy.html
    • https://titukid.files.wordpress.com/2020/06/xevikoxowubivazu.pdf
    • https://munasozudovo100024543.files.wordpress.com/2020/06/79514330848.pdf
    • https://rinizipeg.files.wordpress.com/2020/06/warotasuzivolanosodiraj.pdf
    • https://tuwokovi.files.wordpress.com/2020/06/todunusorijelija.pdf
    • https://fukoboseniki.files.wordpress.com/2020/06/27179087852.pdf
    • https://tipaxoxabenu.files.wordpress.com/2020/06/31924736354.pdf
    • https://mokakofes.files.wordpress.com/2020/06/90413131100.pdf
    • https://mupujinivibu.files.wordpress.com/2020/06/83034181798.pdf
    • https://rilamexix970799637.files.wordpress.com/2020/06/wumutafolofanita.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004bca.bin
5146ba054333d67d5428d7d8fab8ac9659a0152c740539b207025dc9e90ffc20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BCA 9440 bytes

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