Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ea1bdbfd3fbcbb…

MALICIOUS

PDF

30.4 KB Created: 2020-04-06 10:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2021-10-23
MD5: e75c15f5f5150fbda74809bbced4703d SHA-1: f4a1bb7c3675c2c4743cd5a3f5d871ae73a88140 SHA-256: 89ea1bdbfd3fbcbb81a0a53f8aabbd15bfe2a0daa4d4fff147349d4b2f7dfbe9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links to external PDF files hosted on various domains, indicative of a link farm or a method to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external PDF link farm. While no scripts were extracted, the sheer volume of suspicious external links suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fatnail.com/uploads/1/3/0/6/130604877/130604877.html#ge+proficy+machine+edition+9.5+programming+manual PDF link annotation
    • http://worthysfencing.net/uploads/1/3/0/2/130270823/3681d540af1581.pdfIn PDF document text
    • http://claridgehouse.com/uploads/1/3/0/7/130776428/kekelenofezi.pdfIn PDF document text
    • http://oc1toolteam.com/uploads/1/3/0/2/130272609/tavorenu.pdfIn PDF document text
    • http://bluecloudhorizon.com/uploads/1/3/0/8/130814178/58c709ca27eda9.pdfIn PDF document text
    • http://lamaintendue.net/uploads/1/3/0/6/130605521/4307090.pdfIn PDF document text
    • http://guadaluperodeoqueen.org/uploads/1/3/0/4/130435955/somulalep_gagela.pdfIn PDF document text
    • http://shakespearearms.ca/uploads/1/3/0/6/130639162/a1ba28bf940.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E8C 7784 bytes
SHA-256: 5c5b24dbce545cc2dc3077eed2c2169c76d367ed5d8ad13c53d10d46d54223db

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