Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ace41cfbbe5b22…

MALICIOUS

PDF

47.7 KB Created: 2020-05-19 03:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07dd264c5c460bc3fcde09a27119ea53 SHA-1: ef65c052c8317d436392d4e2b8ff50995ac275a4 SHA-256: 56ace41cfbbe5b220fe2f72a2c7cc05803d3e03fa3870614383fdadc3ec88f21
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO poisoning attack. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect users to potentially harmful content.

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://jcitaipei.org/uploads/1/3/0/6/130621626/130621626.html#farberware+superfast+percolator+instructions
    • http://joesperandeo.com/uploads/1/3/0/5/130588295/vijine.pdf
    • http://cobramsc.com/uploads/1/3/0/6/130604061/sujijerujuf.pdf
    • http://keepitreal-kevin.com/uploads/1/3/1/6/131606697/3904502.pdf
    • http://pkflash.org/uploads/1/3/0/7/130738940/telovij.pdf
    • http://expressdistributing.org/uploads/1/3/1/8/131858045/jutikuboxadu.pdf
    • http://allergyspecialistsfl.com/uploads/1/3/0/4/130476102/82383764d2b5422.pdf
    • http://paperproof.com/uploads/1/3/0/6/130639770/feraxizem_potetudojufab_nezesagedoz.pdf
    • http://abby-la-rosa-gymnast.com/uploads/1/3/0/8/130874286/wikorikavutesi.pdf
    • http://reeseforsheriff.com/uploads/1/3/1/4/131437363/69959e2c74b.pdf
    • http://groundedinaspen.com/uploads/1/3/1/0/131070792/resoxegupazun_bakaf.pdf
    • http://buythatsnotright.com/uploads/1/3/1/3/131380598/rifadotatawuwav-kopasotowuwo.pdf
    • http://globalchemtradellc.com/uploads/1/3/1/3/131378837/c4c7f1f.pdf
    • http://marlievipond.com/uploads/1/3/0/5/130551349/260e67.pdf
    • http://p3fg.com/uploads/1/3/0/5/130550948/4152353.pdf
    • http://timshelcreatives.com/uploads/1/3/0/5/130539255/pokezuwevem-kiwemejirizi-vilujalosute-xinelexivi.pdf
    • http://samwoodphoto.com/uploads/1/3/0/7/130740191/614250.pdf
    • http://prosteeldetailing.com/uploads/1/3/1/8/131871739/2019110.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_off000085ca.bin
26bee78bbe22eb5612d2b672986b72ca71e74466f73727882836d6bc9d7aa73e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85CA 13920 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.