Malicious PDF — malware analysis report

Static analysis result for SHA-256 8583a4b72e739f8e…

MALICIOUS

PDF

45.3 KB Created: 2020-06-18 21:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 8052b7ed55464391c74d48b7a6bfab1f SHA-1: 1df5c8e2a088b4449f9e0187d92273f459ee70d2 SHA-256: 8583a4b72e739f8e94d1a6fffb0f850dcd159c485b50ed0fd4317d5edfc5a421
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links to external PDF files, likely as part of a link farm or SEO manipulation tactic. The document body, though obfuscated, contains references to a 'dishwasher manual' and includes several URLs that are part of this link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://orangecountycarpetservices.com/uploads/1/3/1/6/131637498/131637498.html#dishlex+global+300+dishwasher+manual PDF link annotation
    • http://doomedcalliope.com/uploads/1/3/0/8/130813934/992375.pdfIn PDF document text
    • http://ppedugroup.com/uploads/1/3/0/2/130289256/tolowutemiruk_kibinexadanej_lemuniso.pdfIn PDF document text
    • http://websters.space/uploads/1/3/0/6/130639533/pagug-xijazilavanoroz-dumegitutidim-jurivasulotute.pdfIn PDF document text
    • http://yundingyulechengmianfeikaihu.br3h.com/uploads/1/3/0/6/130603888/vodimu_weniji_kokuna.pdfIn PDF document text
    • http://pariscollecteinc.com/uploads/1/3/0/3/130379743/wuvizudizu_livolur_bomen.pdfIn PDF document text
    • http://parkerdancecompany.net/uploads/1/3/0/7/130739287/d85d856d83b31a9.pdfIn PDF document text
    • http://ohio-dogbite.com/uploads/1/3/1/4/131455734/virexad-fusexo-ximusinu-kilodujur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72A4 5644 bytes
SHA-256: 2ac3f31139599f925ca125af89d0bcd36bbc4b3994575142236ff9c20f4da670
font_01_sfnt_off000085b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B1 10468 bytes
SHA-256: aa2d537dae8367c3c6e720d6166af36e043b0192b0dbcb44e1b4fb5f0ac117a6