Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe77f6a58582cd1e…

MALICIOUS

PDF

37.9 KB Created: 2020-06-03 14:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 97655c53d4394b6deeb9d00999dc4cf6 SHA-1: 521dad197d44a393dd2c4ce796e6fa6ab465b4ff SHA-256: fe77f6a58582cd1ef0057579cb0f7248db686992b5a13d89a1d9d8f1a9a8f26b
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents on different domains. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The document body contains garbled text and the URLs suggest a link farm or SEO manipulation tactic, potentially used to distribute malware or engage in phishing. No scripts were extracted from this sample.

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://eeswfl.com/uploads/1/3/0/2/130287279/130287279.html#cripta+antigua+witcher+3+skellige PDF link annotation
    • http://buildonthat.com/uploads/1/3/0/7/130775643/3e4b4b25415.pdfIn PDF document text
    • http://naaboard.com/uploads/1/3/0/6/130621997/kimezilirunox.pdfIn PDF document text
    • http://accuriteprograms.com/uploads/1/3/0/7/130776016/2051640.pdfIn PDF document text
    • http://appletonparenteducation.com/uploads/1/3/0/8/130873912/0ec894ae.pdfIn PDF document text
    • http://quitosltd.com/uploads/1/3/1/8/131871854/zowupuzefodukasem.pdfIn PDF document text
    • http://mail.beckmanappraisals.com/uploads/1/3/0/2/130288383/kovebawawutif_nuxiwepawekose_jubetit_feminalufu.pdfIn PDF document text
    • http://yourcareercollaborator.com/uploads/1/3/1/8/131856567/punupekexav-levunopokur-posikekib.pdfIn PDF document text
    • http://eeswfl.com/uploads/1/3/0/2/130287279/terms.htmlIn PDF document text
    • http://eeswfl.com/uploads/1/3/0/2/130287279/dmca.htmlIn PDF document text
    • http://eeswfl.com/uploads/1/3/0/2/130287279/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zovenix.files.wordpress.com/2020/05/xumuji.pdfIn PDF document text
    • https://samenazon.files.wordpress.com/2020/05/vanatuloxegapisasupe.pdfIn PDF document text
    • https://wuzinukabev.files.wordpress.com/2020/05/wapuzipejopidesiforo.pdfIn PDF document text
    • https://dutilexov.files.wordpress.com/2020/05/13537607061.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C3 11944 bytes
SHA-256: 7e54455ff1731176c5a8c84bc62f16210806f7dfd95f76e6633fbcbb55c48b33